The highest peak at 6,801 feet (2,073 metres) near Wadalei in the north-east of Fergusson Island is an extinct volcano. Seymour Bay is located on the west coast, Sebutuia Bay on the east, and Hughes Bay on the north. The principal settlements, Salamo and Mapamoiwa, are on the southern coast. Gold deposits at Wapolu on the north coast were worked briefly in the mid-1990s.
On June 30, 1942, during World War II, a United States Navy PT-Boat base was established on the island. An Alamo Scouts Training Center was established at Kalo Kalo on November 28, 1943.