South West Island is an island in the Sir Edward Pellew Group in the Gulf of Carpentaria, Northern Territory, Australia. Its area is . All of its population, numbering 10, lives in South West Island (also called Wathanka or Wathunga), a family outstation on the north coast.[1]
The Sir Edward Pellew Group are the traditional lands of the Yanyuwa people, most of whom now live in Borroloola.[2]
It is home to the canefield rat, which are few in number and considered a threatened species in this area, although plentiful in north-eastern Australia.[3]