Mariana Trench Marine National Monument
Mariana Trench Marine National Monument:see under Mariana 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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