The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The state with the longest coastline in the Continental U.S. is Michigan.
31
Louisiana is the only state that grows in land area every year (Due to alluvial deposits from the Mississippi River).
41
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
Forest fires move faster uphill than downhill.
52
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The Atlantic Ocean is saltier than the Pacific Ocean.
54