The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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The Caspian Sea is also classed as the world's largest lake.
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Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
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The Atlantic Ocean is saltier than the Pacific Ocean.
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Israel's Dead Sea is 1,312 feet below sea level.
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Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
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