Amaknak Island or Umaknak Island is the most populated island in the Aleutian Islands, an archipelago which is part of the U.S. state of Alaska. Amaknak is an islet of the Fox Islands archipelago, a portion of the Aleutian Islands, in the Aleutians West Census Area of southwestern Alaska. Amaknak Island is located within Unalaska Bay, an inlet of th…Amaknak Island or Umaknak Island is the most populated island in the Aleutian Islands, an archipelago which is part of the U.S. state of Alaska. Amaknak is an islet of the Fox Islands archipelago, a portion of the Aleutian Islands, in the Aleutians West Census Area of southwestern Alaska. Amaknak Island is located within Unalaska Bay, an inlet of the Bering Sea on the northeast side of Unalaska Island. At their closest point—the channel that leads from Unalaska Bay to Iliuliuk Harbor—the two islands are only about 200 feet apart. There is a 500-foot bridge joining the islands at another close point, where Iliuliuk Harbor connects with Captains Bay.