The Mariana Trench has more length than the largest mountain in the World!
The Challenger Deep in the Mariana Trench is the deepest known point in Earth's oceans. In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 10,994 meters (36,070 feet) below sea level.
This was said by the website geology.com/records/deepest-part-of-the-ocean.shtml
It is obviously the mountains land form because of all the mountains located in the trench.
The Mariana Trench is located in the Pacific Ocean, an average of 124 miles/200km to the east of Asia
The Mariana Trench is almost at freezing point and would be unbearable for people to be in. The Mariana Trench was the very first trench found that we couldn't get to the bottom of.