The Coorong is a national park and lagoon ecosystem in South Australia (Australia), 156 km southeast of Adelaide. Its name is thought to be a corruption of the local Aboriginal people's word kurangh, meaning "long neck"; a reference to the shape of the lagoon system. The name is also thought to be from the Aboriginal word Coorang, "sand dune", a reference to the sand dunes that can be seen between the park and the Southern Ocean.
The western end of the Coorong lagoon is at the Murray Mouth near Hindmarsh Island and the Sir Richard Peninsula, and it extends about 130 km southeast. The park area includes the Coorong itself, and Younghusband Peninsula which separates the Coorong from Encounter Bay in the Southern Ocean. The Coorong has been cut off from Lake Alexandrina by the construction of the Goolwa Barrages (weirs) from Goolwa to Pelican Point during the late 1930s.