Hecate Strait

Hecate Strait (Haida language: K̲andaliig̲wii, also siigaay which means simply "ocean") is a wide but shallow strait between Haida Gwaii and the mainland of British Columbia, Canada. It merges with Queen Charlotte Sound to the south and Dixon Entrance to the north. About 140 km wide at its southern end, Hecate Strait narrows in the north to about 48 km. It is about 260 km in length.

Definition
According to the BCGNIS, the southern boundary of Hecate Strait is defined as a line running from the southernmost point of Price Island to Cape St James on Kunghit Island, the southernmost point of Haida Gwaii. The northern boundary is a line from Rose Point, the northeastern tip of Graham Island, to Hooper Point at the north end of Stephens Island off the mainland.

History
Hecate Strait, because it is so shallow, is especially susceptible to storms and violent weather. The Haida of Haida Gwaii crossed the Hecate Strait to the mainland to plunder coastal villages to take slaves and booty. Sometimes mainland First Nations crossed Hecate Strait to Haida Gwaii, such as a Nisga'a war party from the lower Nass River, which crossed the strait in a retaliatory raid after an attack by Haida Ravens from Hiellen, which took Nisga'a slaves back to Hiellen. The inhabitants of Hiellen, fearing a Nisga'a retaliation, took refuge in Masset. The Nisga'a found Hiellen abandoned and burned it to the ground. Haida from Masset counterattacked, resulting in a long battle at Hiellen and nearby Taaw Tldáaw. The Nisga'a survivors crossed Hecate Strait again to return home.

Hecate Strait was named by Captain George Henry Richards in 1861 or 1862 after his surveying vessel, HMS Hecate.

Geology
During the last ice age, the seafloor in this area was a wide coastal plain stretching south to the Olympic Peninsula and including what is now Queen Charlotte Sound.

Flora and fauna
The strait once contained strong salmon and halibut fisheries.

Hecate Strait is one of the few locations in the world with species from the glass sponge class of fauna. Regions with these sponge are currently protected from damage by commercial fishing.

The Hecate Strait and Queen Charlotte Sound Glass Sponge Reefs Marine Protected Area was designated by the Fisheries and Oceans Canada in February 2017. The MPA is located in the Northern Shelf bioregion of the Pacific Region, southeast of Haida Gwaii, North and South of the entrance to the Douglas Channel. The MPA is composed of three individual areas known as the Northern Reef, the Central Reefs, and the Southern Reef. Together these three areas cover approximately 2,410 square kilometers. The four reef complexes in the Hecate Strait and Queen Charlotte Sound discontinuously cover an area of about 1,000 km2, and are located in glacial troughs between 140 m and 240 m deep.