Mariana Trench
The Mariana Trench is located in the western Pacific Ocean about 200 kilometres east of the Mariana Islands. It is crescent-shaped and measures about 2,550 km in length and 69 km in width. The maximum known depth is 10,984 metres at the southern end of a small slot-shaped valley in its floor known as the Challenger Deep. If Mount Everest were placed...