Notable features of the national park include the Thurat Spires, Kanangra Walls, Mount Colong, and three waterfall systems – the Kalang, the 225-metre (738 ft) two–tiered drop Kanangara and the Morong falls.

There are isolated residual cappings of Permian sandstone in a few places but here the Palaeozoic basement rocks, which are elsewhere buried well below the Permo-Triassic Measures, are on the surface as high land.

Rock types include quartzite, diorite, Devonian rhyolites, rhyo-dacites, Silurian phyllites, slates, siltstones and tuff limestones.

Further east, in the Coxs River area, is the large Kanimbla granite batholith, emplaced during the Carboniferous period.

[5] The complex geology, climate, fire regime, and topography has enabled a wide variety of ecosystems to develop.

High altitude areas subject to strong winds generally support heath and closed scrub communities.

A unique form of tall open forest occurs in the Kedumba Valley, dominated by Camden white gum, an endangered species limited to these populations.

Several species listed on Schedules 1 and 2 of the Threatened Species Conservation Act 1995 (NSW) are found in the Wilderness Area including: The powerful owl (Ninox strenua), squirrel glider (Petaurus norfolcensis), yellow-bellied glider (Petaurus volans), tiger quoll (Dasyurus maculatus), and brush-tailed rock wallaby (Petrogale penicillata).

[5] There are several walking tracks and other sites in the park, these include the:[6] Camping is available on the banks of Morong Creek, at the Boyd River campground, located on Kanangra Road.