Mattawamkeag River

The Mattawamkeag River is a river in Maine. From the confluence of its East Branch and West Branch (45.8334°N, -67.9907°W) in Haynesville, about 10 mi west of the Canada–United States border, the river runs 50.6 mi south and west to its mouth on the Penobscot River in Mattawamkeag.