Yathong Nature Reserve, adjacent to Nombinnie and Round Hill nature reserves, was dedicated as an International Biosphere Reserve in 1977. The eastern half of Yathong lies on Cobar Peneplain, while in the central section, red dune plains of the Darling depression support extensive areas of mallee.

The reserve also has extensive areas of box woodlands, cypress and belah. A number of unusual plant species occur in the area including wild lime, sour bush, wedding bush, iron grass and yellow darling pea.

Habitats include a number of rare or endangered animals including ningaui, kultarr, malleefowl and striated grasswren.

This park is part of the network of feral predator-free areas in NSW which aim to prevent further extinctions and promote the recovery of our most susceptible species.