Derinkuyu in Turkey is an underground city that could shelter up to 20,000 people.

The Sahara Desert receives very little annual rainfall.

Fact #218 · Geography

Antarctica is technically a desert — it receives less precipitation than the Sahara in many areas.

Fact #4256 · Geography

There are more than 17,000 islands in Indonesia — making it the world's largest archipelago country.

Fact #3917 · Geography

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

Fact #3753 · Geography

The Three Gorges Dam spans the Yangtze River.

Fact #1541 · Geography

The Nile River delta is fertile farmland.

Fact #290 · Geography

Water covers more than 70% of Earth's surface.

Fact #149 · Geography

The border between Belgium and the Netherlands runs through a bar in the town of Baarle-Hertog.

Fact #3761 · Geography