| Mark Twain Lake | |
|---|---|
 Lake and Dam | |
  Mark Twain Lake  Mark Twain Lake | |
| Location | Monroe / Ralls counties, Missouri, United States |
| Coordinates | 39°30′21″N 91°43′21″W / 39.505912°N 91.722407°W |
| Type | reservoir |
| Primary inflows | Salt River |
| Primary outflows | Salt River |
| Basin countries | United States |
| Max. length | 30 mi (48 km) |
| Max. width | 1 mi (1.6 km) |
| Surface area | 18,600 acres (7,500 ha) |
| Average depth | 29 ft (8.8 m) |
| Shore length1 | 285 mi (459 km) |
| Surface elevation | 606 ft (185 m) |
| Settlements | Florida |
| 1 Shore length is not a well-defined measure. | |
Mark Twain Lake is a reservoir located in Ralls and Monroe Counties in the U.S. state of Missouri. It was created by the Clarence Cannon Dam (formerly called Joanna Dam) impounding the Salt River and is located about 20 miles (32 km) southwest of Hannibal. The lake was named for Missouri author Mark Twain and part of the area around it is Mark Twain State Park. The village of Florida, the birthplace of Mark Twain, is mostly surrounded by the lake.