The Mariana Trench or Marianas Trench is the deepest part of the world 's oceans. It is located in the western Pacific Ocean, an average of 200 kilometres (124 mi) to the east of the Mariana Islands, in the Western Pacific east of Philippines. It is a crescent - shaped scar in the Earth 's crust, and measures about 2,550 km (1,580 mi) long and 69 km (43 mi) wide on average. It reaches a maximum - known depth of 10,994 metres (36,070 ft) (± 40 metres (130 ft)) 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 11,034 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. In 2009, the Marianas Trench was established as a United States National Monument.
what is the deepest oceans in the world
the western Pacific Ocean