South Branch Souhegan River

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The South Branch of the Souhegan River is a 5.8 mile long (9.4 km)^[1] river located in northern Massachusetts and southern New Hampshire in the United States. It is a tributary of the Souhegan River, which flows to the Merrimack River and ultimately to the Gulf of Maine.

The South Branch begins near Mount Watatic at the outlet of Stodge Meadow Pond in the town of Ashburnham, Massachusetts and flows through a chain of small lakes (Marble Pond, Ward Pond, and Watatic Pond) before flowing northeast into the town of Ashby, Massachusetts. North of Ashby, the river enters New Ipswich, New Hampshire, passes through a small flood-control reservoir, and joins the West Branch to form the Souhegan River, just north of the intersection known as "Gibson Four Corners".