The first forests appeared during the Devonian period.

Mongolia is the world's least densely populated country, with about 5 people per square mile.

Fact #3753 · Geography

The Caspian Sea is the world's largest inland body of water and is classified as a lake despite its salt water.

Fact #3759 · Geography

The Great Wall of China is not visible from space with the naked eye — this is a common myth.

Fact #3330 · Geography

Ciudad Perdida in Colombia predates Machu Picchu.

Fact #1661 · Geography

The Gotthard Base Tunnel is one of the longest railway tunnels in the world.

Fact #1533 · Geography

Glacial periods caused sea levels to drop significantly.

Fact #748 · Geography

The Andes Mountains stretch along South America's western coast.

Fact #193 · Geography

There is more water in Earth's mantle than in all the oceans on the surface.

Fact #3594 · Geography