The Pribilof Islands (formerly the Northern Fur Seal Islands) are a group of four volcanic islands off the coast of mainland Alaska, in the Bering Sea. The Pribilof Islands are a birdwatching attraction, home to many species that do not fly in North America beyond Alaska. More than 240 species have been identified, and an estimated two million seabirds nest there annually. St. Paul is particularly popular, having a high cliff wall, known as Ridge Wall, above the Bering Sea.