located_in_the_administrative_territorial_entity mount gilbert 
Mount Gilbert is a volcano which forms the northern part ___MASK61___ Akun Island in the eastern Aleutian Islands , USA . Active fumaroles were documented 1 mi ( 1 . 5 km ) northeast ___MASK61___ the summit in the early 1900s . ___MASK19___ is a U . S . state located in the northwest extremity of North America . The Canadian administrative divisions of British Columbia and Yukon border the state to the east ; its most extreme western part is Attu Island ; it has a maritime border with Russia to the west across the Bering Strait . To the north are the Chukchi and Beaufort seas  the southern parts of the Arctic Ocean . The Pacific Ocean lies to the south and southwest . ___MASK19___ is the largest state in the United States by area , the 3rd least populous and the least densely populated of the 50 United States . Approximately half of ___MASK19___ ' s residents ( the total estimated at 738 , 432 by the U . S . Census Bureau in 2015 ) live within the Anchorage metropolitan area . ___MASK19___ ' s economy is dominated by the fishing , natural gas , and oil industries , resources which it has in abundance . Military bases and tourism are also a significant part of the economy . Akun Island is one ___MASK61___ the Fox Islands subgroup ___MASK61___ the Aleutian Islands in the Aleutians East Borough ___MASK61___ southwestern ___MASK19___ .