The 10,460-hectare (25,800-acre) park extends along the coast of Discovery Bay from Cape Nelson north-westwards for 50 kilometres (31 mi) to the border with South Australia.

The park was listed on Australia's now-defunct Register of the National Estate,[2] and lies within the traditional lands of the Gunditjmara people.

An important wetland is Long Swamp, fed by a groundwater aquifer, where declining water levels have led to encroachment by bare twig-sedge (Baumea sp.)

As water levels continue to decline, Woolly Tea-tree is beginning to colonise formerly sedge-dominated areas.

Mammals found in the park include the long-nosed potoroo, heath mouse and swamp antechinus.