Mexico City is built on top of an underground resevoir!
47
The Caspian Sea is also classed as the world's largest lake.
52
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
It takes a drop of ocean water more than 1,000 years to circulate around the world.
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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.
17
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
Australia's Great Barrier Reef is 1,250 miles long!
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