The Caspian Sea is also classed as the world's largest lake.
52
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
More than 25% of the world's forests are in Siberia.
51
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
Israel's Dead Sea is 1,312 feet below sea level.
48
The Amazon rainforest produces more than 20% the world's oxygen supply.
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