How deep is the Mariana Trench?
35,876 ft10,935 m at Challenger Deep
Challenger Deep, at the southern end of the Mariana Trench in the western Pacific, is the deepest part of the ocean. NOAA gives its depth as approximately 10,935 meters.
Challenger Deep, the deepest part of the ocean
approximately 10,935 m (35,876 ft)
The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench
Challenger Deep is approximately 10,935 meters (35,876 feet) deep.
Applies to: Challenger Deep, southern end of the Mariana Trench, western Pacific
From NOAA National Ocean Service, How deep is the ocean?. Page read on 2026-09-28.
Average depth of the ocean
about 3,682 m (12,080 ft)
The average depth of the ocean is about 3,682 meters (12,080 feet).
Applies to: All oceans, NOAA average
From NOAA National Ocean Service, How deep is the ocean?. Page read on 2026-09-28.
For scale
| Figure | Feet | Page |
|---|---|---|
| Challenger Deep | 35,876 | NOAA (above) |
| Denali summit, above sea level | 20,310 | Denali and Rainier |
| Average ocean depth | 12,080 | NOAA (above) |
| Crater Lake, deepest US lake | 1,943 | Deepest lakes |