Doumer Island is an island 7.2 km (4.5 mi) long and 3.2 km (2.0 mi) wide, surmounted by a snow-covered pyramidal peak, 515 m (1,690 ft), lying between the south portions of Anvers Island and Wiencke Island in the Palmer Archipelago of Antarctica. It was first seen by the Belgian Antarctic Expedition, 1897–99, under Adrien de Gerlache.