The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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There's a lake under Antarctica that is 25 million years old called Lake Vostok.
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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 Niagara Falls moves upstream at an average rate of about 295ft a century!
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It's still possible to see the division between East and West Germany due to different light bulbs.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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Check your map! Virginia extends farther west than West Virginia.
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The Caspian Sea is also classed as the world's largest lake.
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