The Caspian Sea, the world's largest landlocked body of water, is 28 meters below sea level.

The ocean contains structures larger than mountain ranges.

Fact #2152 · Ocean

There are underwater waterfalls caused by differences in water density.

Fact #2442 · Ocean

Many deep-sea animals lack strong pigmentation.

Fact #1409 · Ocean

The ocean is, on average, 3,682 meters deep — the deepest point is about 11,000 meters.

Fact #5116 · Ocean

The Earth's oceans cover more than 70% of the planet's surface.

Fact #220 · Ocean

The world's longest coral reef system, the Great Barrier Reef, is visible from space.

Fact #4773 · Ocean

Phytoplankton populations have declined by about 40% since 1950, threatening the marine food chain.

Fact #5230 · Ocean

The deep ocean remains largely unexplored by humans.

Fact #1416 · Ocean