The Bunyip River rises below Mount Beenak, part of the southern portion of the Yarra Ranges within the Bunyip State Park, near Tomahawk Gap, and flows generally south by east then south, at times via an aqueduct, joined by four minor tributaries, before reaching its confluence with the Tarago River to form the Main Drain.

The river descends approximately 437 metres (1,434 ft) over its 27 kilometres (17 mi) course.

[4] In the Aboriginal Boonwurrung language, the name for the river is Banib, meaning "a fabulous, large, black amphibious monster".

[3] The river is named after the bunyip, an Aboriginal mythological and legendary character from lakes and swamps.

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