The Caspian Sea is also classed as the world's largest lake.
52
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
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.
1
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
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