There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
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
Check your map! Virginia extends farther west than West Virginia.
67
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49