The Caspian Sea is also classed as the world's largest lake.
52
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
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
The time interval from first sighting of the iceberg that sank the Titanic to impact was a little over 30 seconds.
105
It's impossible to sink in the Dead Sea without equipment!
72
There was once an undersea post office in the Bahamas.
241
Jellyfish as a species are actually older than dinosaurs and sharks.
383