<P> Coordinates: 11 ° 21 ′ N 142 ° 12 ′ E ﻿ / ﻿ 11.350 ° N 142.200 ° E ﻿ / 11.350; 142.200 </P> <P> The Mariana Trench or Marianas Trench, located in the western Pacific Ocean approximately 200 kilometres (124 mi) east of the Mariana Islands, is the deepest point in the world's oceans . It is a crescent - shaped trough in the Earth's crust averaging about 2,550 km (1,580 mi) long and 69 km (43 mi) wide . The maximum - known depth is 10,994 metres (36,070 ft) (± 40 metres (130 ft)) at the southern end of a small slot - shaped valley in its floor known as the Challenger Deep . However, some, unrepeated, measurements place the deepest portion at 11,034 metres (36,201 ft). For comparison: if Mount Everest were dropped into the trench at this point, its peak would still be over 2 kilometres (1.2 mi) underwater . </P> <P> At the bottom of the trench the water column above exerts a pressure of 1,086 bars (15,750 psi), more than 1,000 times the standard atmospheric pressure at sea level . At this pressure, the density of water is increased by 4.96%, so that 95.27 litres of water under the pressure of the Challenger Deep would contain the same mass as 100 litres at the surface . The temperature at the bottom is 1 to 4 ° C (34 to 39 ° F). </P> <P> The trench is not the part of the seafloor closest to the centre of the Earth . This is because the Earth is not a perfect sphere; its radius is about 25 kilometres (16 mi) smaller at the poles than at the equator . As a result, parts of the Arctic Ocean seabed are at least 13 kilometres (8.1 mi) closer to the Earth's centre than the Challenger Deep seafloor . </P>

Density of water at bottom of mariana trench
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