nothing

the biggest lake above sea level on semisopochnoi island is 14 to 20 thousand ft. :)

it is a little but only in the not too too cold of places

Alaska. At 179°37' East, the easternmost tip of Semisopochnoi is the easternmost land location in the United States, and is arguably the easternmost location in North America. Semisopochnoi sits only 23 minutes west of the 180th meridian and therefore is in the Eastern Hemisphere

Alaska is the westernmost AND the easternmost U.S. state. Hawaii is in the Eastern Hemisphere. Most of Alaska is in the Western Hemisphere. The Aleutian Islands are part of Alaska. The 180th meridian (the International Date Line) crosses the Aleutian Islands making Alaska the westernmost U.S. state in the Western Hemisphere. Part of Alaska's Aleutian Islands are on the other side of the 180th meridian (the International Date Line). Therefore that part of Alaska is in the Eastern Hemisphere and makes Alaska also the easternmost U.S. state.