Wollemi National Park

The Wollemi National Park is a protected national park and wilderness area that is located in the Central West and Hunter region of New South Wales, in eastern Australia. The 501703 ha park, the second largest national park in New South Wales, contains the 361113 ha Wollemi Wildernessthe largest such wilderness area in Australia and is situated approximately 130 km northwest of Sydney.

The Wollemi National Park is one of the eight protected areas that, in 2000, was inscribed to form part of the UNESCO World Heritagelisted Greater Blue Mountains Area. The Wollemi National Park is the most northwesterly of the eight protected areas within the World Heritage Site. The national park forms part of the Great Dividing Range.

Due to the park's ruggedness, much of it is undiscovered by humans and the many canyons have yet to be explored. The only known living wild specimens of the Wollemi pine (Wollemia nobilis) were discovered in 1994. Special efforts were made to protect the trees when the 2019-20 Australian bushfires burned through the park.

The national park is bounded to the north by the Goulburn River National Park and the Bylong Valley Way; to the east by the Yengo National Park, the Parr State Conservation Area, and the Putty Road; to the south by the Blue Mountains National Park and the Bells Line of Road; to the southwest by the Wolgan Valley and the Gardens of Stone National Park; and to the west by open farmland that surround the towns of and  and the Capertee Valley.

Geology
The Wollemi National Park is located on the western edge of the Sydney Basin. It sits on four strata of sedimentary rock; the Narrabeen and Hawkesbury sandstone and shale, the Illawarra and Singleton Permian coal measures and the Wianamatta shales. The strata at this area of the Sydney Basin have an upwards tilt to the north-west. Throughout most of the park the Hawkesbury and Wianamatta series have been eroded away exposing the Narrabeen group.

The landscape of the park is dominated by deep valleys, canyons, cliffs and waterfalls, formed by the weathering of the sandstone and claystone the Narrabeen group consists of. The parts of the park that lie on the Narrabeen and Hawkesbury sandstones generally have shallow soil with low nutrient levels while areas that lie on the Wianamatta shale usually have deeper and more nutrient rich soils allowing for a greater diversity of plant life. The coal measures are visible beneath cliff lines along river valleys. This layer is generally rich in nutrients and weathers to form deep clay loams. Tertiary basalt is common in the north west of the park. Basaltic peaks include Mount Coriaday, Mount Monundilla and Mount Coricudgy, the highest peak in the northern Blue Mountains. In some locations the basalt in the core of extinct volcanoes has eroded faster than the surrounding sandstone.

The Wollemi National Park is key in maintaining the quality of many tributary rivers to the Hawkesbury River and Goulburn-Hunter River catchments. The national park incorporates rivers such as the Wolgan River, Colo River and Capertee River which arise from outside the park. The Colo River is regarded as the last unpolluted river in New South Wales because the majority of it flows through the Wollemi National Park.

Biology and ecology
Eucalypt dominated open forests comprise 90% of Wollemi National Park, with over 70 species of Eucalypt recorded. The remaining 10% of the National Park comprises rainforest, heath and grassland.

The variety of habitats within Wollemi National Park allow for large diversity in animals. 58 reptile species, 38 frog species, 235 bird species and 46 mammal species have been recorded in the park.

The only known living wild specimens of the Wollemi pine (Wollemia nobilis), a species thought to have become extinct approximately thirty million years ago, were discovered in three small stands within deep canyons in 1994. The location is kept secret to protect the groves from diseases and trampling.

Besides the Wollemi Mint Bush, the park contains populations of the rare Banksia conferta subsp. penicillata, only described in 1981. The Wollemi Stringybark is a newly discovered species of Eucalyptus tree.



Aboriginal sites
There are many aboriginal sites within the park including cave paintings, axe grinding grooves and rock carvings. In 2003 the discovery of Eagle's Reach cave was publicly announced. This site was found by bushwalkers in 1995 but remained unknown to the wider community until a team from the Australian Museum reached the cave in May 2003. The art within this small cave is estimated to be up to 4,000 years old and it consists of up to a dozen layers of imagery depicting a wide variety of motifs rendered in ochre and charcoal. The team who recorded this site counted over 200 separate images, mainly of animals and birds but also stencils of hands, axes and a boomerang.

It is a very significant site and the remote location is being kept secret for its own protection.

Activities
Ganguddy Campground is a campsite located on the Cudgegong River in the park. The local Wiradjuri Aboriginal people know the area as Ganguddy, the alternative name is Dunns Swamp. National Parks and Wildlife Service, New South Wales manages the location.
 * Bushwalking
 * Canyoning
 * Canoeing
 * Camping
 * Abseiling

Historical places

 * Wolgan Valley
 * Newnes
 * Newnes glow worm tunnel
 * Zig Zag Railway
 * Oil shale Mining
 * Glen Davis

Climate
The Wollemi area features an oceanic climate (Köppen climate classification Cfb) with mild to warm summers, cool to cold winters and generally steady precipitation year-round, though with a peak in the first few months of the year.