It is located off the coast of the Alaska Panhandle, near its southernmost portion, 20 miles (32 km) west of Dall Island, in the Prince of Wales-Hyder Census Area.
The island is 5.2 miles (8.4 km) long and covers an area of 3.97 sq mi (10.29 km2).
Forrester Island was originally named "Santa Cristina" by Juan Pérez in 1774.
Royal Navy officer George Dixon named the island "Forrester Island" in 1787, which was the name adopted by George Vancouver on the Vancouver Expedition in 1793.
[7] The longest recorded migration of a Steller sea lion was 1,600 miles (2,600 km) between Forrester Island and Cape Newenham in Bristol Bay.