Geography
How big is a Mariana Trench?
The Mariana Trench is 10.9 km (7 mi) deep.
Measurements
| Length | 11 km (7 mi) |
| Height | 10.9 km (7 mi) |
The Challenger Deep, the trench's deepest point, lies about 10,935 m below sea level (2021 NOAA-supported survey) — the deepest known point in Earth's oceans. Height here means depth below the surface; the visible chasm breadth (~11 km) is approximate. The trench itself stretches ~2,550 km along the Pacific floor.
Did you know?
- The pressure at the bottom exceeds 1,000 atmospheres — like an elephant standing on your thumbnail.
- More people have walked on the Moon than have reached the bottom of the Challenger Deep.