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Test Case Easter Island (Rapa Nui; Isla de Pascua) is an island and special territory of Chile in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian Triangle in Oceania. The island is most famous for its nearly 1,000 extant monumental statues, called moai, which were created by the early Rapa Nui people. In 1995, UNESCO named Easter Island a World Heritage Site, with much of the island protected within Rapa Nui National Park.

Experts disagree on when the island's Polynesian inhabitants first reached the island. While many in the research community cited evidence that they arrived around the year 800, a 2007 study found compelling evidence that they arrived closer to 1200. The inhabitants created a thriving and industrious culture, as evidenced by the island's numerous enormous stone moai and other artifacts. But land clearing for cultivation and the introduction of the Polynesian rat led to gradual deforestation. By the time of European arrival in 1722, the island's population was estimated to be 2,000 to 3,000. European diseases, Peruvian slave raiding expeditions in the 1860s, and emigration to other islands such as Tahiti further depleted the population, reducing it to a low of 111 native inhabitants in 1877.

Chile annexed Easter Island in 1888. In 1966, the Rapa Nui were granted Chilean citizenship. In 2007 the island gained the constitutional status of "special territory" (territorio especial). Administratively, it belongs to the Valparaíso Region, constituting a single commune (Isla de Pascua) of the Province of Isla de Pascua. The 2017 Chilean census registered 7,750 people on the island, of whom 3,512 (45%) considered themselves Rapa Nui.

Easter Island is one of the world's remotest inhabited islands. The nearest inhabited land (around 50 residents in 2013) is Pitcairn Island, 2075 km away; the nearest town with a population over 500 is Rikitea, on the island of Mangareva, 2606 km away; the nearest continental point lies in central Chile, 3512 km away.

Etymology
The name "Easter Island" was given by the island's first recorded European visitor, the Dutch explorer Jacob Roggeveen, who encountered it on Easter Sunday (5 April), 1722, while searching for "Davis Land". Roggeveen named it Paasch-Eyland (18th-century Dutch for "Easter Island"). The island's official Spanish name, Isla de Pascua, also means "Easter Island".

The current Polynesian name of the island, Rapa Nui ("Big Rapa"), was coined after the slave raids of the early 1860s, and refers to the island's topographic resemblance to the island of Rapa in the Bass Islands of the Austral Islands group. Norwegian ethnographer Thor Heyerdahl argued that Rapa was Easter Island's original name and that Rapa Iti was named by refugees from it.

The phrase Te pito o te henua has been said to be the island's original name since French ethnologist Alphonse Pinart gave it the romantic translation "the Navel of the World" in his Voyage à l'Île de Pâques, published in 1877. William Churchill (1912) inquired about the phrase and was told that there were three te pito o te henua, these being the three capes (land's ends) of the island. The phrase appears to have been used in the same sense as the designation "Land's End" at the tip of Cornwall. He was unable to elicit a Polynesian name for the island and concluded that there may not have been one.

According to Barthel (1974), oral tradition has it that the island was first named Te pito o te kainga a Hau Maka, "The little piece of land of Hau Maka". But there are two words pronounced pito in Rapa Nui, one meaning "end" and one "navel", and the phrase can thus also mean "The Navel of the World". Another name, Mata ki te rangi, means "Eyes looking to the sky".

Islanders are referred to in Spanish as pascuense, but members of the indigenous community are commonly called Rapa Nui.

Felipe González de Ahedo named it Isla de San Carlos ("Saint Charles's Island", the patron saint of Charles III of Spain) or Isla de David (probably the phantom island of Davis Land; sometimes translated as "Davis's Island" ) in 1770.

Introduction
Oral tradition states the island was first settled by a two-canoe expedition originating from Marae Renga (or Marae Toe Hau—otherwise known as Cook Islands), and led by the chief Hotu Matu'a and his captain Tu'u ko Iho. The island was first scouted after Haumaka dreamed of such a far-off country; Hotu deemed it a worthwhile place to flee from a neighboring chief, one to whom he had already lost three battles. At their time of arrival, the island had one lone settler, Nga Tavake 'a Te Rona. After a brief stay at Anakena, the colonists settled in different parts of the island. Hotu's heir, Tu'u ma Heke, was born on the island. Tu'u ko Iho is viewed as the leader who brought the statues and caused them to walk.

The Easter Islanders are considered Southeast Polynesians. Similar sacred zones with statuary (marae and ahu) in East Polynesia demonstrate homology with most of Eastern Polynesia. At contact, populations were about 3,000–4,000.

By the 15th century, two confederations, hanau, of social groupings, mata, existed, based on lineage. The western and northern portion of the island belonged to the Tu'u, which included the royal Miru, with the royal center at Anakena, though Tahai and Te Peu served as earlier capitals. The eastern part of the island belonged to the 'Otu 'Itu. Shortly after the Dutch visit, from 1724 until 1750, the 'Otu 'Itu fought the Tu'u for control of the island. This continued until the 1860s. Famine followed the burning of huts and the destruction of fields. Social control vanished as the ordered way of life gave way to lawlessness and predatory bands as the warrior class took over. Homelessness prevailed, with many living underground. After the Spanish visit, from 1770 onward, a period of statue toppling, huri mo'ai, commenced. This was an attempt by competing groups to destroy the socio-spiritual power, or mana, represented by statues, making sure to break them in the fall to ensure they were dead and without power. None were left standing by the time of the arrival of the French missionaries in the 1860s.

Between 1862 and 1888, about 94% of the population perished or emigrated. The island was victimized by blackbirding from 1862 to 1863, resulting in the abduction or killing of about 1,500, with 1,408 working as indentured servants in Peru. Only about a dozen eventually returned to Easter Island, but they brought smallpox, which decimated the remaining population of 1,500. Those who perished included the island's tumu ivi 'atua, bearers of the island's culture, history, and genealogy besides the rongorongo experts.

Rapa Nui settlement


Estimated dates of initial settlement of Easter Island have ranged from 300 to 1200 CE, though the current best estimate for colonization is in the. Easter Island colonization likely coincided with the arrival of the first settlers in Hawaii. Rectifications in radiocarbon dating have changed almost all of the previously posited early settlement dates in Polynesia. Ongoing archaeological studies provide this late date: "Radiocarbon dates for the earliest stratigraphic layers at Anakena, Easter Island, and analysis of previous radiocarbon dates imply that the island was colonized late, about . Significant ecological impacts and major cultural investments in monumental architecture and statuary thus began soon after initial settlement."

According to oral tradition, the first settlement was at Anakena. Researchers have noted that the Caleta Anakena landing point provides the island's best shelter from prevailing swells as well as a sandy beach for canoe landings and launchings, so it is a likely early place of settlement. However radiocarbon dating concludes that other sites preceded Anakena by many years, especially the Tahai by several centuries.

The island was populated by Polynesians who most likely navigated in canoes or catamarans from the Gambier Islands (Mangareva, 2600 km away) or the Marquesas Islands, 3200 km away. According to some theories, such as the Polynesian Diaspora Theory, there is a possibility that early Polynesian settlers arrived from South America due to their remarkable sea-navigation abilities. Theorists have supported this through the agricultural evidence of the sweet potato. The sweet potato was a favoured crop in Polynesian society for generations but it originated in South America, suggesting interaction between these two geographic areas. However, recent research suggests that sweet potatoes may have spread to Polynesia by long-distance dispersal long before the Polynesians arrived. When James Cook visited the island, one of his crew members, a Polynesian from Bora Bora, Hitihiti, was able to communicate with the Rapa Nui. It has been noted that the early jumping-off points for the early Polynesian colonization of Easter Island are more likely to have been from Mangareva, Pitcairn and Henderson, which lie about halfway between the Marquesas and Easter. It has been observed that there is great similarity with the Rapa Nui language and Early Mangarevan, similarities between a statue found in Pitcairn and some statues found in Easter Island, the resemblance of tool styles in Easter Island to those in Mangareva and Pitcairn, and correspondences of skulls found in Easter Island to two skulls found in Henderson, all suggesting Henderson and Pitcairn islands to have been early stepping-stones from Mangareva to Easter Island, which in 1999, a voyage with reconstructed Polynesian boats was able to reach Easter Island from Mangareva after merely a seventeen and a half day voyage.



According to oral traditions recorded by missionaries in the 1860s, the island originally had a strong class system: an ariki, or high chief, wielded great power over nine other clans and their respective chiefs. The high chief was the eldest descendant through first-born lines of the island's legendary founder, Hotu Matu'a. The most visible element in the culture was the production of massive moai statues that some believe represented deified ancestors. According to National Geographic, "Most scholars suspect that the moai were created to honor ancestors, chiefs, or other important personages, However, no written and little oral history exists on the island, so it's impossible to be certain."

It was believed that the living had a symbiotic relationship with the dead in which the dead provided everything that the living needed (health, fertility of land and animals, fortune etc.) and the living, through offerings, provided the dead with a better place in the spirit world. Most settlements were located on the coast, and most moai were erected along the coastline, watching over their descendants in the settlements before them, with their backs toward the spirit world in the sea.

Ecocide theory
In his book Collapse: How Societies Choose to Fail or Succeed, Jared Diamond suggested that cannibalism took place on Easter Island after the construction of the moai contributed to environmental degradation when extreme deforestation (ecocide) destabilized an already precarious ecosystem. Archeological record shows that at the time of the initial settlement the island was home to many species of trees, including at least three species which grew up to 15 m or more: Paschalococos (possibly the largest palm trees in the world at the time), Alphitonia zizyphoides, and Elaeocarpus rarotongensis. At least six species of land birds were known to live on the island. A major factor that contributed to the extinction of multiple plant species was the introduction of the Polynesian rat. Studies by paleobotanists have shown rats can dramatically affect the reproduction of vegetation in an ecosystem. In the case of Rapa Nui, recovered plant seed shells showed markings of being gnawed on by rats. This version of the history speculates a high former population to the island that had already declined before Europeans arrived. Barbara A. West wrote, "Sometime before the arrival of Europeans on Easter Island, the Rapanui experienced a tremendous upheaval in their social system brought about by a change in their island's ecology... By the time of European arrival in 1722, the island's population had dropped to 2,000–3,000 from a high of approximately 15,000 just a century earlier."

By that time, 21 species of trees and all species of land birds became extinct through some combination of over-harvesting, over-hunting, rat predation, and climate change. The island was largely deforested, and it did not have any trees taller than 3 m. Loss of large trees meant that residents were no longer able to build seaworthy vessels, significantly diminishing their fishing abilities. According to this version of the history, the trees were used as rollers to move the statues to their place of erection from the quarry at Rano Raraku. Deforestation also caused erosion which caused a sharp decline in agricultural production. This was exacerbated by the loss of land birds and the collapse in seabird populations as a source of food. By the 18th century, islanders were largely sustained by farming, with domestic chickens as the primary source of protein.

As the island became overpopulated and resources diminished, warriors known as matatoa gained more power and the Ancestor Cult ended, making way for the Bird Man Cult. Beverly Haun wrote, "The concept of mana (power) invested in hereditary leaders was recast into the person of the birdman, apparently beginning circa 1540, and coinciding with the final vestiges of the moai period." This cult maintained that, although the ancestors still provided for their descendants, the medium through which the living could contact the dead was no longer statues but human beings chosen through a competition. The god responsible for creating humans, Makemake, played an important role in this process. Katherine Routledge, who systematically collected the island's traditions in her 1919 expedition, showed that the competitions for Bird Man (Rapa Nui: tangata manu) started around 1760, after the arrival of the first Europeans, and ended in 1878, with the construction of the first church by Roman Catholic missionaries who formally arrived in 1864. Petroglyphs representing Bird Men on Easter Island are the same as some in Hawaii, indicating that this concept was probably brought by the original settlers; only the competition itself was unique to Easter Island. According to Diamond and Heyerdahl's version of the island's history, the huri mo'ai – "statue-toppling" – continued into the 1830s as a part of fierce internal wars. By 1838, the only standing moai were on the slopes of Rano Raraku, in Hoa Hakananai'a in Orongo, and Ariki Paro in Ahu Te Pito Kura.

Criticism of the Ecocide Theory
Diamond and West's version of the history is highly controversial. A study headed by Douglas Owsley published in 1994 asserted that there is little archaeological evidence of pre-European societal collapse. Bone pathology and osteometric data from islanders of that period clearly suggest few fatalities can be attributed directly to violence. Research by Binghamton University anthropologists Robert DiNapoli and Carl Lipo in 2021 suggests that the island experienced steady population growth from its initial settlement until European contact in 1722. The island never had more than a few thousand people prior to European contact, and their numbers were increasing rather than dwindling.

European contact
The first recorded European contact with the island was on 5 April 1722, Easter Sunday, by Dutch navigator Jacob Roggeveen. His visit resulted in the death of about a dozen islanders, including the tumu ivi 'atua, and the wounding of many others.

The next foreign visitors (on 15 November 1770) were two Spanish ships, San Lorenzo and Santa Rosalia, under the command of Captain Don Felipe Gonzalez de Ahedo. The Spanish were amazed by the "standing idols", all of which were erect at the time.

Four years later, in 1774, British explorer James Cook visited Easter Island; he reported that some statues had been toppled. Through the interpretation of Hitihiti, Cook learned the statues commemorated their former high chiefs, including their names and ranks.



On 10 April 1786, French Admiral Jean-François de Galaup, comte de Lapérouse anchored at Hanga Roa at the start of a circumnavigation of the Pacific. He made a detailed map of the bay, including his anchorage points, as well as a more generalised map of the island, plus some illustrations.

19th century
A series of devastating events killed or removed most of the population in the 1860s. In December 1862, Peruvian slave raiders struck. Violent abductions continued for several months, eventually capturing around 1,500 men and women, half of the island's population. Among those captured were the island's paramount chief, his heir, and those who knew how to read and write the rongorongo script, the only Polynesian script to have been found to date, although debate exists about whether this is proto-writing or true writing.

When the slave raiders were forced to repatriate the people they had kidnapped, carriers of smallpox disembarked together with a few survivors on each of the islands. This created devastating epidemics from Easter Island to the Marquesas islands. Easter Island's population was reduced to the point where some of the dead were not even buried.

Tuberculosis, introduced by whalers in the mid-19th century, had already killed several islanders when the first Christian missionary, Eugène Eyraud, died from this disease in 1867. It ultimately killed approximately a quarter of the island's population. In the following years, the managers of the sheep ranch and the missionaries started buying the newly available lands of the deceased, and this led to great confrontations between natives and settlers.

Jean-Baptiste Dutrou-Bornier bought up all of the island apart from the missionaries' area around Hanga Roa and moved a few hundred Rapa Nui to Tahiti to work for his backers. In 1871 the missionaries, having fallen out with Dutrou-Bornier, evacuated all but 171 Rapa Nui to the Gambier islands. Those who remained were mostly older men. Six years later, only 111 people lived on Easter Island, and only 36 of them had any offspring. From that point on, the island's population slowly recovered. But with over 97% of the population dead or gone in less than a decade, much of the island's cultural knowledge had been lost.

Alexander Salmon, Jr., the son of an English Jewish merchant and a Pōmare Dynasty princess, eventually worked to repatriate workers from his inherited copra plantation. He eventually bought up all lands on the island with the exception of the mission, and was its sole employer. He worked to develop tourism on the island and was the principal informant for the British and German archaeological expeditions for the island. He sent several pieces of genuine Rongorongo to his niece's husband, the German consul in Valparaíso, Chile. Salmon sold the Brander Easter Island holdings to the Chilean government on 2 January 1888, and signed as a witness to the cession of the island. He returned to Tahiti in December 1888. He effectively ruled the island from 1878 until his cession to Chile in 1888.

Easter Island was annexed by Chile on 9 September 1888 by Policarpo Toro by means of the "Treaty of Annexation of the Island" (Tratado de Anexión de la isla). Toro, representing the government of Chile, signed with Atamu Tekena, designated "King" by the Roman Catholic missionaries after the paramount chief and his heir had died. The validity of this treaty is still contested by some Rapa Nui. Officially, Chile purchased the nearly all encompassing Mason-Brander sheep ranch, comprised from lands purchased from the descendants of Rapa Nui who died during the epidemics, and then claimed sovereignty over the island.

20th century


Until the 1960s, the surviving Rapa Nui were confined to Hanga Roa. The rest of the island was rented to the Williamson-Balfour Company as a sheep farm until 1953. This exemplified the introduction of private property into Rapa Nui. The island was then managed by the Chilean Navy until 1966, at which point the island was reopened in its entirety. The Rapa Nui were given Chilean citizenship in 1966.

Following the 1973 Chilean coup d'état that brought Augusto Pinochet to power, Easter Island was placed under martial law. Tourism slowed, land was broken up, and private property was distributed to investors. During his time in power, Pinochet visited Easter Island on three occasions. The military built military facilities and a city hall.

After an agreement in 1985 between Chile and United States, the runway at Mataveri International Airport was enlarged and was inaugurated in 1987. The runway was expanded 423 m, reaching 3353 m. Pinochet is reported to have refused to attend the inauguration in protest at pressures from the United States over human rights.

21st century
Fishers of Rapa Nui have shown their concern of illegal fishing on the island. "Since the year 2000 we started to lose tuna, which is the basis of the fishing on the island, so then we began to take the fish from the shore to feed our families, but in less than two years we depleted all of it", Pakarati said. On 30 July 2007, a constitutional reform gave Easter Island and the Juan Fernández Islands (also known as Robinson Crusoe Island) the status of "special territories" of Chile. Pending the enactment of a special charter, the island continues to be governed as a province of the V Region of Valparaíso.

Species of fish were collected in Easter Island for one month in different habitats including shallow lava pools and deep waters. Within these habitats, two holotypes and paratypes, Antennarius randalli and Antennarius moai, were discovered. These are considered frog-fish because of their characteristics: "12 dorsal rays, last two or three branched; bony part of first dorsal spine slightly shorter than second dorsal spine; body without bold zebra-like markings; caudal peduncle short, but distinct; last pelvic ray divided; pectoral rays 11 or 12".

In 2018, the government decided to limit the stay period for tourists from 90 to 30 days because of social and environmental issues faced by the Island to preserve its historical importance.

A tsunami warning was declared for Easter Island after the 2022 Hunga Tonga–Hunga Ha'apai eruption and tsunami.

Easter Island was closed to tourists from March 17, 2020 until August 4, 2022 due to the COVID-19 pandemic. Then in early October 2022, just two months after the island was reopened to tourists, a forest fire burned nearly 148 acres (60 hectares) of the island, causing irreparable damage to some of the moai. Arson is suspected.

Indigenous rights movement
Starting in August 2010, members of the indigenous Hitorangi clan occupied the Hangaroa Eco Village and Spa. The occupiers allege that the hotel was bought from the Pinochet government, in violation of a Chilean agreement with the indigenous Rapa Nui, in the 1990s. The occupiers say their ancestors had been cheated into giving up the land. According to a BBC report, on 3 December 2010, at least 25 people were injured when Chilean police using pellet guns attempted to evict from these buildings a group of Rapa Nui who had claimed that the land the buildings stood on had been illegally taken from their ancestors. In 2020 the conflict was settled. The property rights were transferred to the Hitorangi clan while the owners retained the exploitation of the hotel for 15 years.

In January 2011, the UN Special Rapporteur on Indigenous People, James Anaya, expressed concern about the treatment of the indigenous Rapa Nui by the Chilean government, urging Chile to "make every effort to conduct a dialogue in good faith with representatives of the Rapa Nui people to solve, as soon as possible the real underlying problems that explain the current situation". The incident ended in February 2011, when up to 50 armed police broke into the hotel to remove the final five occupiers. They were arrested by the government, and no injuries were reported.

Geography
Easter Island is one of the world's most isolated inhabited islands. Its closest inhabited neighbour is Pitcairn Island, 1931 km to the west, with approximately 50 inhabitants. The nearest continental point lies in central Chile near Concepción, at 3512 km. Easter Island's latitude is similar to that of Caldera, Chile, and it lies 3510 km west of continental Chile at its nearest point (between Lota and Lebu in the Biobío Region). Isla Salas y Gómez, 415 km to the east, is closer but is uninhabited. The Tristan da Cunha archipelago in the southern Atlantic competes for the title of the most remote island, lying 2430 km from Saint Helena island and 2816 km from the South African coast.

The island is about 24.6 km long by 12.3 km at its widest point; its overall shape is triangular. It has an area of 163.6 km², and a maximum elevation of 507 m above mean sea level. There are three Rano (freshwater crater lakes), at Rano Kau, Rano Raraku and Rano Aroi, near the summit of Terevaka, but no permanent streams or rivers.

Geology
Easter Island is a volcanic island, consisting mainly of three extinct coalesced volcanoes: Terevaka (altitude 507 metres) forms the bulk of the island, while two other volcanoes, Poike and Rano Kau, form the eastern and southern headlands and give the island its roughly triangular shape. Lesser cones and other volcanic features include the crater Rano Raraku, the cinder cone Puna Pau and many volcanic caves including lava tubes. Poike used to be a separate island until volcanic material from Terevaka united it to the larger whole. The island is dominated by hawaiite and basalt flows which are rich in iron and show affinity with igneous rocks found in the Galápagos Islands.

Easter Island and surrounding islets, such as Motu Nui and Motu Iti, form the summit of a large volcanic mountain rising over 2000 m from the sea bed. The mountain is part of the Salas y Gómez Ridge, a (mostly submarine) mountain range with dozens of seamounts, formed by the Easter hotspot. The range begins with Pukao and next Moai, two seamounts to the west of Easter Island, and extends 2700 km east to the Nazca Ridge. The ridge was formed by the Nazca Plate moving over the Easter hotspot.

Located about 350 km east of the East Pacific Rise, Easter Island lies within the Nazca Plate, bordering the Easter Microplate. The Nazca-Pacific relative plate movement due to the seafloor spreading, amounts to about 150 mm per year. This movement over the Easter hotspot has resulted in the Easter Seamount Chain, which merges into the Nazca Ridge further to the east. Easter Island and Isla Salas y Gómez are surface representations of that chain. The chain has progressively younger ages to the west. The current hotspot location is speculated to be west of Easter Island, amidst the Ahu, Umu and Tupa submarine volcanic fields and the Pukao and Moai seamounts.

Easter Island lies atop the Rano Kau Ridge, and consists of three shield volcanoes with parallel geologic histories. Poike and Rano Kau exist on the east and south slopes of Terevaka, respectively. Rano Kau developed between 0.78 and 0.46 Ma from tholeiitic to alkalic basalts. This volcano possesses a clearly defined summit caldera. Benmoreitic lavas extruded about the rim from 0.35 to 0.34 Ma. Finally, between 0.24 and 0.11 Ma, a 6.5 km fissure developed along a NE–SW trend, forming monogenetic vents and rhyolitic intrusions. These include the cryptodome islets of Motu Nui and Motu Iti, the islet of Motu Kao Kao, the sheet intrusion of Te Kari Kari, the perlitic obsidian Te Manavai dome and the Maunga Orito dome.

Poike formed from tholeiitic to alkali basalts from 0.78 to 0.41 Ma. Its summit collapsed into a caldera which was subsequently filled by the Puakatiki lava cone pahoehoe flows at 0.36 Ma. Finally, the trachytic lava domes of Maunga Vai a Heva, Maunga Tea Tea, and Maunga Parehe formed along a NE-SW trending fissure.

Terevaka formed around 0.77 Ma of tholeiitic to alkali basalts, followed by the collapse of its summit into a caldera. Then at about 0.3Ma, cinder cones formed along a NNE-SSW trend on the western rim, while porphyritic benmoreitic lava filled the caldera, and pahoehoe flowed towards the northern coast, forming lava tubes, and to the southeast. Lava domes and a vent complex formed in the Maunga Puka area, while breccias formed along the vents on the western portion of Rano Aroi crater. This volcano's southern and southeastern flanks are composed of younger flows consisting of basalt, alkali basalt, hawaiite, mugearite, and benmoreite from eruptive fissures starting at 0.24 Ma. The youngest lava flow, Roiho, is dated at 0.11 Ma. The Hanga O Teo embayment is interpreted to be a 200 m high landslide scarp.

Rano Raraku and Maunga Toa Toa are isolated tuff cones of about 0.21 Ma. The crater of Rano Raraku contains a freshwater lake. The stratified tuff is composed of sideromelane, slightly altered to palagonite, and somewhat lithified. The tuff contains lithic fragments of older lava flows. The northwest sector of Rano Raraku contains reddish volcanic ash. According to Bandy, "...all of the great images of Easter Island are carved from" the light and porous tuff from Rano Raraku. A carving was abandoned when a large, dense and hard lithic fragment was encountered. However, these lithics became the basis for stone hammers and chisels. The Puna Pau crater contains an extremely porous pumice, from which was carved the Pukao "hats". The Maunga Orito obsidian was used to make the "mataa" spearheads.

In the first half of the 20th century, steam reportedly came out of the Rano Kau crater wall. This was photographed by the island's manager, Mr. Edmunds.

The ancient Easter Island residents captured fresh groundwater where it seeped into the sea.

Ecology
Easter Island, together with its closest neighbour, the tiny island of Isla Salas y Gómez 415 km farther east, is recognized by ecologists as a distinct ecoregion, the Rapa Nui subtropical broadleaf forests. The original subtropical moist broadleaf forests are now gone, but paleobotanical studies of fossil pollen, tree moulds left by lava flows, and root casts found in local soils indicate that the island was formerly forested, with a range of trees, shrubs, ferns, and grasses. A large extinct palm, Paschalococos disperta, related to the Chilean wine palm (Jubaea chilensis), was one of the dominant trees as attested by fossil evidence. Like its Chilean counterpart it probably took close to 100 years to reach adult height. The Polynesian rat, which the original settlers brought with them, played a very important role in the disappearance of the Rapa Nui palm. Although some may believe that rats played a major role in the degradation of the forest, less than 10% of palm nuts show teeth marks from rats. The remains of palm stumps in different places indicate that humans caused the trees to fall because in large areas, the stumps were cut efficiently.

The loss the palms to make the settlements led to their extinction almost 350 years ago. The toromiro tree (Sophora toromiro) was prehistorically present on Easter Island, but is now extinct in the wild. However, the Royal Botanic Gardens, Kew and the Göteborg Botanical Garden are jointly leading a scientific program to reintroduce the toromiro to Easter Island. With the palm and the toromiro virtually gone, there was considerably less rainfall as a result of less condensation. After the island was used to feed thousands of sheep for almost a century, by the mid-1900s the island was mostly covered in grassland with nga'atu or bulrush (Schoenoplectus californicus tatora) in the crater lakes of Rano Raraku and Rano Kau. The presence of these reeds, which are called totora in the Andes, was used to support the argument of a South American origin of the statue builders, but pollen analysis of lake sediments shows these reeds have grown on the island for over 30,000 years. Before the arrival of humans, Easter Island had vast seabird colonies containing probably over 30 resident species, perhaps the world's richest. Such colonies are no longer found on the main island. Fossil evidence indicates six species of land birds (two rails, two parrots, one owl, and one heron), all of which have become extinct. Five introduced species of land bird are known to have breeding populations (see List of birds of Easter Island).

Lack of studies results in poor understanding of the oceanic fauna of Easter Island and waters in its vicinity; however, possibilities of undiscovered breeding grounds for humpback, southern blue and pygmy blue whales including Easter Island and Isla Salas y Gómez have been considered. Potential breeding areas for fin whales have been detected off northeast of the island as well.

The immunosuppressant drug sirolimus was first discovered in the bacterium Streptomyces hygroscopicus in a soil sample from Easter Island. The drug is also known as rapamycin, after Rapa Nui. It is now being studied for extending longevity in mice.

Trees are sparse, rarely forming natural groves, and it has been argued whether native Easter Islanders deforested the island in the process of erecting their statues, and in providing sustenance for an overconsumption of natural resources from a overcrowded island. Experimental archaeology demonstrated that some statues certainly could have been placed on "Y" shaped wooden frames called miro manga erua and then pulled to their final destinations on ceremonial sites. Other theories involve the use of "ladders" (parallel wooden rails) over which the statues could have been dragged. Rapa Nui traditions metaphorically refer to spiritual power (mana) as the means by which the moai were "walked" from the quarry. Recent experimental recreations have proven that it is fully possible that the moai were literally walked from their quarries to their final positions by use of ropes, casting doubt on the role that their existence plays in the environmental collapse of the island.

Given the island's southern latitude, the climatic effects of the Little Ice Age (about 1650 to 1850) may have exacerbated deforestation, although this remains speculative. Many researchers point to the climatic downtrend caused by the Little Ice Age as a contributing factor to resource stress and to the palm tree's disappearance. Experts, however, do not agree on when the island's palms became extinct.

Jared Diamond dismisses past climate change as a dominant cause of the island's deforestation in his book Collapse which assesses the collapse of the ancient Easter Islanders. Influenced by Heyerdahl's romantic interpretation of Easter's history, Diamond insists that the disappearance of the island's trees seems to coincide with a decline of its civilization around the 17th and 18th centuries, alongside declines of fish bones in middens (suggesting a decline in fishing) and then declines in bird bones, which he attributes to habitat loss. He notes that they stopped making statues at that time and started destroying the ahu. But the link is weakened because the Bird Man cult continued to thrive and survived the great impact caused by the arrival of explorers, whalers, sandalwood traders, and slave raiders.

Benny Peiser noted evidence of self-sufficiency when Europeans first arrived. The island still had smaller trees, mainly toromiro, which became extinct in the wild in the 20th century probably because of slow growth and changes in the island's ecosystem. Cornelis Bouman, Jakob Roggeveen's captain, stated in his logbook, "... of yams, bananas and small coconut palms we saw little and no other trees or crops." According to Carl Friedrich Behrens, Roggeveen's officer, "The natives presented palm branches as peace offerings." According to ethnographer Alfred Mètraux, the most common type of house was called "hare paenga" (and is known today as "boathouse") because the roof resembled an overturned boat. The foundations of the houses were made of buried basalt slabs with holes for wooden beams to connect with each other throughout the width of the house. These were then covered with a layer of totora reed, followed by a layer of woven sugarcane leaves, and lastly a layer of woven grass.

Peiser claims that these reports indicate that large trees existed at that time, which is perhaps contradicted by the Bouman quote above. Plantations were often located farther inland, next to foothills, inside open-ceiling lava tubes, and in other places protected from the strong salt winds and salt spray affecting areas closer to the coast. It is possible many of the Europeans did not venture inland. The statue quarry, only 1 km from the coast with an impressive cliff 100 m high, was not explored by Europeans until well into the 19th century.

Easter Island has suffered from heavy soil erosion in recent centuries, aggravated by massive historic deforestation alongside modern sheep farming throughout most of the 20th century. Jakob Roggeveen reported that Easter Island was exceptionally fertile. "Fowls are the only animals they keep. They cultivate bananas, sugar cane, and above all sweet potatoes." In 1786 Jean-François de La Pérouse visited Easter Island and his gardener declared that "three days' work a year" would be enough to support the population. Rollin, a major in the Pérouse expedition, wrote, "Instead of meeting with men exhausted by famine... I found, on the contrary, a considerable population, with more beauty and grace than I afterwards met in any other island; and a soil, which, with very little labor, furnished excellent provisions, and in an abundance more than sufficient for the consumption of the inhabitants." The islanders' innovation of lithic mulching - the practice of covering fields with gravel or rocks to trap moisture and improve soil fertility - is a well-known and effective practice in dry areas of the premodern world.

According to Diamond, the oral traditions (the veracity of which has been questioned by Routledge, Lavachery, Mètraux, Peiser, and others) of the current islanders seem obsessed with cannibalism, which he offers as evidence supporting a rapid collapse. For example, he states, to severely insult an enemy one would say, "The flesh of your mother sticks between my teeth." This, Diamond asserts, means the food supply of the people ultimately ran out. Cannibalism, however, was widespread across Polynesian cultures. Human bones have not been found in earth ovens other than those behind the religious platforms, indicating that cannibalism in Easter Island was a ritualistic practice. Contemporary ethnographic research has proven there is scarcely any tangible evidence for widespread cannibalism anywhere and at any time on the island. The first scientific exploration of Easter Island (1914) recorded that the indigenous population strongly rejected allegations that they or their ancestors had been cannibals.

Notable people

 * Laura Alarcón Rapu, governor (since 2018)
 * Tiare Aguilera Hey, member of the Chilean Constitutional Convention (since 2021)
 * Felipe González de Ahedo (1714–1802), a Spanish navigator and cartographer; annexed Easter Island in 1770.
 * Angata (c. 1853–1914), native catechist and prophetess who led a 1914 rebellion
 * Thomas Barthel (1923–1997) a German ethnologist and epigrapher
 * Carmen Cardinali (born 1944) a Rapa Nui Chilean professor, governor of Easter Island, 2010-2014.
 * Jean-Baptiste Dutrou-Bornier (1834–1876) a French mariner, removed many of the Rapa Nui people and turned the island into a sheep ranch.
 * Sebastian Englert (1888–1969), missionary and ethnologist
 * Eugène Eyraud (1820–1868), missionary
 * Thor Heyerdahl (1914–2002), a Norwegian adventurer and ethnographer
 * Melania Hotu (born 1959), governor (2006–2010, 2015–2018)
 * Marta Hotus Tuki (born 1969), governor (2014–2015)
 * Riro Kāinga (died 1898 or 1899), last person to hold title of king and rule before Chilean consolidation
 * Kings of Easter Island
 * Hotu Matuꞌa, island founder
 * William Mulloy (1917–1978), an American anthropologist and archaeologist
 * Nga'ara (died 1859), one of the last ‘ariki
 * Jacobo Hey Paoa, first Rapa Nui male to earn a law degree and become an attorney
 * Pedro Edmunds Paoa (born 1961), mayor and former governor
 * Juan Edmunds Rapahango (1923–2012), former mayor
 * Hippolyte Roussel (1824–1898), a French priest and missionary
 * Katherine Routledge (1866–1935), an English archaeologist and anthropologist
 * Alexander Ariʻipaea Salmon (1855–1914) English-Jewish-Tahitian de facto ruler of Easter Island, 1878-1888.
 * Mahani Teave (born 1983), a Chilean American classical pianist
 * Atamu Tekena (c. 1850–1892), missionary installed King who ceded island to Chile
 * José Fati Tepano, first Rapa Nui male to serve as a titular judge upon completing training in Chile
 * Juan Tepano (1867–1947), indigenous leader and cultural informant
 * Valentino Riroroko Tuki (1932–2017) last claimant to the Rapa Nui throne
 * Lynn Rapu Tuki (born 1969), head-teacher, promotes the arts and traditions of the Rapa Nui People.
 * Luz Zasso Paoa a Rapa Nui politician, mayor of Easter Island, 2008-2012.

Transportation
Easter Island is served by Mataveri International Airport, with jet service (currently Boeing 787s) from LATAM Chile and, seasonally, subsidiaries such as LATAM Perú.