The deepest part of Earth’s oceans is the Challenger Deep in the Mariana Trench, at about 10,935 meters, or roughly 35,876 feet, below sea level. A common rounded way to say it is “about 11 kilometers” deep.

Quick Scoop

  • Deepest point: Challenger Deep, Mariana Trench
  • Depth: about 10.9 km, or about 36,000 ft
  • Average ocean depth: about 3,682 meters, or 12,080 feet

Simple comparison

Measure| Depth
---|---
Average ocean depth 3| 3,682 m
Deepest known point 3| 10,935 m

The deep ocean there is extremely dark, cold, and under intense pressure.