The Caspian Sea is also classed as the world's largest lake.
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The city of Houston, Texas is built on a swamp and is slowly sinking!
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The state of Florida is bigger than England!
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Mexico City is built on top of an underground resevoir!
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
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The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
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