[3] The park features subtropical rainforests protecting threatened plants and animals, such as the sooty owl, red-legged pademelon and yellow-bellied glider.

The rugged landscape of Mount Lindesay, Dome Mountain and Edinburgh Castle have provided the inspiration for many local Aboriginal legends.

Focal Peak Volcano situated in Mt Barney National Park was active 23 million years ago and was responsible for the eroded volcanic remains of Mount Lindesay, Dome Mountain and Edinburgh Castle that dominate the landscape today.

Inside Toonumbar National Park there are a number of jurabihls (increase sites) which were recorded with the assistance of the late Auntie Millie Boyd in 1974 by Howard Creamer.

These types of sites (involving a complex set of religious and ritualistic beliefs) are of National significance due to their rarity in Australia and the rest of the world.