Umnak Pass, is a strait between the Bering Sea and the North Pacific Ocean in the Aleutian Islands in Alaska. It lies between Unalaska Island to the northeast and Unimak Island to the southwest.Merriam-Webster's Geographical Dictionary, Third Edition, p. 1218.
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References Merriam-Webster's Geographical Dictionary, Third Edition. Springfield, Massachusetts: Merriam-Webster, Incorporated, 1997. .