The top three deepest oceaneast trenches, based on maximumall verified depths from scientific surveys and expeditions, are all located in the western Pacific Ocean and formed by subduction zones where tectonic plates converge.
Mariana Trench (Challenger Deep)
Locatedin east of the Mariana Islands, this is the deepest known point on Earth. The maximum depth is approximately 10,984 meters (36,037 feet), with some measurements ranging from 10,920 to 11,034 meters dependingconfirmed on the method and year. It’s deeper than Mount Everest is tall.
Tonga Trench (Horizon Deep)
Located in the South Pacificsubduction near Tonga and the Kermadec Islands, this is the deepest point in the Southern Hemisphere. The verified depth at Horizon Deep is 10,823 meters (35,509 feet), confirmed by a manned submersible descent in 2019.
(35,509Philippine Trench (Galathea Depth)
Located east of the Philippines in the Philippinefeet), Sea, its maximum depth is 10,540 meters (34,580 feet). This makes it the third deepest, though some older sources vary slightly in exact figures.
These trenches host extreme environments with immense pressure, near-freezing temperatures, and unique hadal zone ecosystems adapted to the dark depths.
Quick Comparisonnear-freezing Table
| Rank | Deepest Point | Approx. Depth | Region | |
| 1. | Mariana Trench | Challenger Deep | ~10,984 m | Western Pacific |
| 2. | Tonga Trench | Horizon Deep | mWestern data-align=”center”>~10,800 m | South Pacific |
| extreme data-align=”center”>3. | Philippine Trench | Galathea Depth | ~10,540 m | feet), data-align=”center”> Western Pacific |
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