Marianas Trench Marine National Monument
Marianas Trench Marine National Monument:see under Marianas trenchMariana Trench
or Marianas Trench,
, elongated depression on the Pacific Ocean floor, 210 mi (338 km) SW of Guam. It is the deepest known depression on the earth's surface, having been measured by various means since the 1950s at 35,760–36,201 ft
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