That volcano lies on Amaknak Island in this island chain, which was once known as  ► Dutch Harbor.
This archipelago was the site of the largest underground nuclear tests ever conducted the United States, which took place on Amchitka Island. This island chain contains the most diverse seabird colony in the Northern Hemisphere located on Buldir Island, and this island chain's largest city is located in a subgroup of islands which divides this island chain's West Census Area and East Borough. That subgroup, the (*) Fox Islands, is also home to the tallest mountain in this island chain, the Makushin Volcano. That volcano lies on Amaknak Island in this island chain, which was once known as  ► Dutch Harbor. For 10 points, name this island chain home to Attu.
This archipelago was the site of the largest underground nuclear tests ever conducted the United States, which took place on Amchitka Island.
Aleutian Islands