The Gascoyne River is in the Gascoyne region of Western Australia. It meets the ocean in Carnarvon. Carnarvon is a 9.5 hour drive or 1:15 hour flight north of Perth.
It comprises three branches in its upper reaches. Draining the Collier Range, the river rises as the Gascoyne River (North Branch) on Three Rivers Station near the Great Northern Highway, 100 kilometres (62 mi) northeast of Peak Hill and flows for approximately 125 kilometres (78 mi). The (Middle Branch) rises west of Beyondie Lakes, east of Kumarina and east of the Great Northern Highway and flows for approximately 15 kilometres (9.3 mi). The (South Branch) rises near the Doolgunna homestead and flows for approximately 15 kilometres (9.3 mi). The Gascoyne flows generally west by southwest and is joined by 36 tributaries including the Lyons River, Landor River, Thomas River, and numerous other creeks and gullies. The river reaches its mouth as it flows into Shark Bay and the Indian Ocean at Carnarvon. The river descends 514 metres (1,686 ft) over its 865-kilometre (537 mi) course