The river descends 664 metres ( 2,178 ft ) over its 122 - kilometre ( 76 mi ) course .
Within Lake Wellington , the Avon forms its confluence with the Latrobe River , empties into Bass Strait via the Mitchell River south of Lakes Entrance .
The river descends 664 metres ( 2,178 ft ) over Avon 's 122 - kilometre ( 76 mi ) course .
Within Lake Wellington , the Avon forms its confluence with the Latrobe River , empties into Bass Strait via the Mitchell River south of Lakes Entrance .