<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

An ambitious new Florida trail links two U.S. national parks
How reading the night sky helped Black Americans survive
Does a woman’s fertility really plummet at age 35?

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