The Mariana Trench or Marianas Trench is the deepest part of the worlds oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islands. The trench is about 2,550 kilometres long but has an average width of only 69 kilometres . It reaches a maximum-known depth of 10,994 m or 6.831 mi at a small slot-shaped valley in its floor known as the Challenger Deep, at its southern end, although some unrepeated measurements place the deepest portion at 11.03 kilometres .

At the bottom of the trench the water column above exerts a pressure of 1,086 bars . At this pressure, the density of water is increased by 4.96%, making 95 litres of water under the pressure of the Challenger Deep contain the same mass as 100 litres at the surface. The temperature at the bottom is 1 to 4 °C.

The trench is not the part of the seafloor closest to the center of the Earth. This is because the Earth is not a perfect sphere; its radius is about 25 kilometres less at the poles than at the equator. As a result, parts of the Arctic Ocean seabed are at least 13 kilometres closer to the Earths center than the Challenger Deep seafloor. (source : wikipedia)

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