| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Marianas trench |
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Marianas trough, or Marianas deep (mâr´´  n´ z) (KEY) , elongated depression on the Pacific Ocean floor, 210 mi (338 km) SW of Guam. It is the deepest (35,798.6 ft/10,911.5 m at the Challenger Deep) known depression on the earth’s surface. A U.S. navy bathyscape reached its bottom in 1960; a 1995 Japanese probe made what is probably the most accurate measurement of its depth. |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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