Stewart Strait (54°0′S38°6′W / 54.000°S 38.100°W / -54.000; -38.100) is a strait 2 nautical miles (3.7km) wide between Bird Island and the Willis Islands, off the west end of South Georgia. The strait was navigated and charted by Captain James Cook in 1775; later called Willis Sound by sealers and whalers; recharted by DI in 1930 and named after Walter Stuart, Customs Officer in South Georgia at that time.