The river rises in the southern ranges of Namadgi National Park, south of Canberra, with flow generated by runoff and melting snow during spring from the Snowy Mountains. The river flows generally south-east, joined by one minor tributaries, before reaching its confluence with the Gudgenby River, south of Tharwa; descending 159 metres (522 ft) over its 26-kilometre (16 mi) course.[1]