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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The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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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 Caspian Sea is also classed as the world's largest lake.
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One cubic mile of seawater contains about 50 pounds of gold.
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
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The Sahara desert expands at about 1km per month.
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Australia's Great Barrier Reef is 1,250 miles long!
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