 The name is also thought to be from the Aboriginal word "Coorang", "sand dune", a reference to the sand dunes that form the Younghusband Peninsula.The western end of the Coorong lagoon is at the Murray Mouth near Hindmarsh Island and the Sir Richard Peninsula, and it extends about southeast.The national park area includes the Coorong itself, and Younghusband Peninsula which separates the Coorong from Encounter Bay in the Southern Ocean.