1. Lake Superior is, by surface area, the world's largest freshwater lake.
2. The surface area of Lake Superior (31,700 square miles or 82,170 square kilometers) is greater than the combined areas of Vermont, Massachusetts, Rhode Island, Connecticut, and New Hampshire.
3. Lake Superior contains as much water as all the other Great Lakes combined, even throwing in two extra Lake Eries. Its volume is second only to Russia's Lake Baikal.
4. Lake Superior contains 10% of all the earth's fresh surface water.
5. There is enough water in Lake Superior (3,000,000,000,000,000--or 3 quadrillion-- gallons) to flood all of North and South America to a depth of one foot.
6. The deepest point in Lake Superior (about 40 miles north of Munising, Michigan) is 1,300 feet (400 meters) below the surface.
7. Over 300 streams and rivers empty into Lake Superior.
8. The Lake Superior shoreline, if straightened out, could connect Duluth and the Bahama Islands.
9. The average underwater visibility of Lake Superior is 27 feet, making it easily the cleanest and clearest of the Great Lakes. Underwater visibility in places reaches 100 feet. Lake Superior has been described as "the most oligotrophic lake in the world."
10. The lake is about 350 miles (563 km) in length and 160 miles (257 km) in width.
11. In the summer, the sun sets more than 35 minutes later on the western shore of Lake Superior than at its southeastern edge.
12. Lake Superior has over 400 islands, the largest of which is Isle Royale, with a size of 207 square miles.
13. Waves of over 40 feet in height have been recorded on Lake Superior.
14. Travel by car around Lake Superior covers a distance of about 1,300 miles.
15. Sudden changes in winds or barometric pressure around Lake Superior can produce seiches, a phenomena which results in water levels rising or falling as much as six feet along a coast in a short period of time.
16. Water in Lake Superior is retained, on average, 191 years