A box jellyfish has one of the most potent venoms in the ocean.

Dolphins surf ocean waves purely for fun — one of the clearest signs of play behavior in animals.

Fact #5979 · Ocean

There is a river in the ocean — the Gulf Stream moves more water than all of Earth's rivers combined.

Fact #3404 · Ocean

Some deep‑sea fish create their own light.

Fact #2475 · Ocean

The deep-sea environment is near freezing in temperature.

Fact #1419 · Ocean

The Dead Sea is so salty that nothing larger than bacteria can survive in it, and swimmers float effortlessly.

Fact #4257 · Ocean

The ocean contains structures larger than mountain ranges.

Fact #1796 · Ocean

Some fish can change color to blend with their surroundings.

Fact #392 · Ocean

Certain fish can survive in oxygen-poor water.

Fact #453 · Ocean