The Caspian Sea is also classed as the world's largest lake.
52
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
476
There was once an undersea post office in the Bahamas.
241
In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
707