<p><br> A wave breaks over a coral reef in the Red Sea. Coral reefs form when colonies of tropical marine plants and animals with limestone skeletons rise atop earlier generations.</p>

Red Sea Reef


A wave breaks over a coral reef in the Red Sea. Coral reefs form when colonies of tropical marine plants and animals with limestone skeletons rise atop earlier generations.

Photograph by Nick Caloyianis

Underwater Landscapes

See photos of underwater landscapes and download free desktop wallpapers, from National Geographic.

Read This Next

Once devastated, these reefs have seen an amazing rebirth
How soaring ocean temperatures are affecting corals
Philippines' reefs are some of the most vibrant—but in peril

Go Further

Subscriber Exclusive Content

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet