The Murray River, or River Murray is Australia's largest river. At 2,575 kilometres (1,600 miles) in length, the Murray rises in the Australian Alps, draining the western side of Australia's highest mountains and, for most of its length, meanders across Australia's inland plains, forming the border between New South Wales and Victoria as it flows to the northwest, before turning south for its final 500 kilometres or so into South Australia then ends at the mouth at Lake Alexandrina.