Plog Island is an island 1.9 kilometres (1 nmi) long in Prydz Bay, 0.93 kilometres (0.5 nmi) north of Lake Island and 0.93 kilometres (0.5 nmi) west of Breidnes Peninsula, Vestfold Hills. Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition (1936–37) and named "Plogoy", as being descriptive of the island's shape.