In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
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The Caspian Sea is also classed as the world's largest lake.
52
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
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
There was once an undersea post office in the Bahamas.
241
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46