The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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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 water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
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More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
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The state with the longest coastline in the Continental U.S. is Michigan.
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Louisiana is the only state that grows in land area every year (Due to alluvial deposits from the Mississippi River).
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