How big is the Mariana Trench?

The Mariana Trench was created by the process that occurs in a subduction zone, where two massive slabs of oceanic crust collide. At a subduction zone, one piece of oceanic crust is pushed and pulled underneath the other, sinking into the Earth's mantle, the layer under the crust. read more

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. read more

On the southern end of Mariana Trench is the deepest part of the ocean. It’s called Challenger Deep - Wikipedia. You can put Mt. Everest (29,029 ft) inside Challenger Deep (approx. 35,814 ft). read more