National Geographic Documentary - The Deepest Place on Earth Mariana Trench - BBC Documentary This article is about the deep sea trench. For the. The Deepest Place on Earth Mariana Trench | Documentary 2015. The Mariana Trench or Marianas Trench is the deepest part of the world's oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islands. The trench is about 2550 kilometres. Subscribe for a new video every week! ▻▻ The Mariana Trench is located near the Mariana Islands. National Geographic Documentary - The Most Dangerous Deepest Place On Earth - BBC Documentary This article is about the deep sea trench. For the.