| Long Lost Lake | |
|---|---|
| Location | Clearwater County, Minnesota |
| Lake type | closed-basin lake |
| Primary inflows | groundwater |
| Primary outflows | none |
| Basin countries | United States |
| Surface area | 2 km2 (490 acres) |
| Residence time | 1.8 years |
| Surface elevation | 489 m - 493 m |
Long Lost Lake is located in Clearwater County, Minnesota, United States. The closed-basin lake's waterlevel rose from 489 m in 1991 to 491 m in 2001.