It is formed by the confluence of the 7.1-mile-long (11.4 km) West Branch and the 17.5-mile-long (28.2 km) East Branch of the North River in the town of Colrain, Massachusetts.  The river is a tributary of the Deerfield River, joining it just north of the village of Shelburne Falls.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed April 1, 2011
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