10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
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The Caspian Sea is also classed as the world's largest lake.
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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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Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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Europe is the only continent without a desert.
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It takes a drop of ocean water more than 1,000 years to circulate around the world.
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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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There are more than 50,000 earthquakes throughout the world every year!
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