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'Semisopochnoi Island' is part of the Rat Islands group in the western Aleutian Islands. The island is uninhabited and provides an important nesting area for maritime birds. The island is of volcanic origin, containing several volcanoes including Mount Cerberus.
Semisopochnoi has a land area of 221.673 km² (85.588 sq mi).
At 179°46'E, it is the easternmost location in the United States and North America, as it sits only 14 minutes west of 180°, and therefore in the Eastern Hemisphere.

"Semisopochnoi" (Russian: ''Семисопочный'') means "Seven Hills".

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References

★ Semisopochnoi Island: Block 1138, Census Tract 1, Aleutians West Census Area, Alaska United States Census Bureau