The Geary River rises in the Otway Ranges in southwest Victoria, near Parkers Spur, and flows generally east by south through the Port Campbell National Park before reaching its river mouth and emptying into Bass Strait, northeast of Cape Otway and south of the town of Marengo. From its highest point, the river descends 256 metres (840 ft) over its 5-kilometre (3.1 mi) course.[2]