Israel's Dead Sea is 1,312 feet below sea level.
48
The Caspian Sea is also classed as the world's largest lake.
52
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Mexico City is built on top of an underground resevoir!
47
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109