The Barwon River is a perennial river of the Corangamite catchment, located in The Otways and the Bellarine Peninsula regions of the Australian state of Victoria.
Fed by the confluence of the East and West Branches of the river, the Barwon River rises in the Otway Ranges and flows generally north by east and then east, joined by thirteen tributaries including the Leigh and Moorabool rivers and flowing through Lake Connewarre, before reaching its mouth and emptying into Bass Strait at Barwon Heads. The river flows adjacent to the settlement of Winchelsea and Greater Geelong. The estuarine section of the river forms part of the Port Phillip Bay (Western Shoreline) and Bellarine Peninsula Ramsar Site as a wetland of international importance, as well as of the Bellarine Wetlands Important Bird Area. From its highest point including its source confluence, the river descends 295 metres over its 160-kilometre course.
The river is crossed by a number of bridges in Geelong. Of particular note is the unusual one-lane truss bridge in Newtown, Geelong. The Breakwater in East Geelong was constructed by Foster Fyans to supply drinking water.
