Croker Island is an island in the Arafura Sea off the coast of the Northern Territory, Australia, 200 km northeast of Darwin. It is separated from Cobourg Peninsula in the west by Bowen Strait, which is 2.5 km wide in the south and up to 7 km in the north, and 8.5 km long. In the north and east is the Arafura Sea, and in the south and southeast Mountnorris Bay. Croker Island measures 43 km from Point David (south, local name Inngirnatj) to Cape Croker (north), up to 15 km wide, and has an area of 331.5 km² (128.0 sq. miles).