Hindmarsh RiverThe Hindmarsh River is a river located in the Fleurieu Peninsula region in the Australian state of South Australia.Course and featuresThe Hindmarsh River rises in the Mount Lofty Range below Mount Cone flows generally south by east through the Hindmarsh Valley before reaching its mouth and emptying into Encounter Bay at. The river descends over its course.EtymologyThe river is named in honour of Rear Admiral Sir John Hindmarsh, the first Governor of South Australia.