Charlton Island is an uninhabited island located in James Bay, Qikiqtaaluk Region, Nunavut, Canada. Located northwest of Rupert Bay, it has an area of 308 km2 (119 sq mi). It contains the southernmost point in Nunavut.Thomas James, who gave his name to James Bay, wintered here in 1631 and named the island after King Charles. The founders of Fort-Rupert (1668) must have seen it and Charles Bayly was nearly driven ashore here in 1674.