| Little Southwest Branch Saint John River | |
|---|---|
| Origin | Maine |
| Mouth | SW Branch Saint John River |
| Basin countries | United States |
| Mouth elevation | 1,190 feet (360 m) |
The Little Southwest Branch Saint John River is a 49.7 kilometres (30.9 mi)[1] river in Somerset County, Maine. From its source () in Maine Township 6, Range 19, WELS, it flows northward a few miles east of the Canada – United States border to its mouth on the Southwest Branch Saint John River in T 9, R 18.