Walyunga National Park is a national park in Western Australia, 35 km northeast of Perth along the Great Northern Highway. The park is situated just behind the Darling Scarp in the Darling Range spread over a steeply sided valley. The Swan-Avon River and the Eastern Railway run through the park and the Avon Descent passes through a set of rapids along this section. The area is dominated by granite outcrops along with smaller dolerite areas, the tops of hills are capped with laterite.