|- elevation||365 feet (111 m)|
|190 feet (58 m)|
|Length||51 miles (82 km)|
|- left||East Branch Mattawamkeag River|
|- right||West Branch Mattawamkeag River, Molunkus Stream|
The Mattawamkeag River is a river in Maine. From the confluence of its East Branch and West Branch ( ) in Haynesville, about 10 miles (16 km) west of the Canada–United States border, the river runs 50.6 miles (81.4 km) south and west to its mouth on the Penobscot River in Mattawamkeag.
- "Mattawamkeag River". Geographic Names Information System. United States Geological Survey. 30 September 1980. Retrieved 2010-05-30.
- Maine Streamflow Data from the USGS
- Maine Watershed Data From Environmental Protection Agency
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