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The Natchaug River is a 17.9-mile-long (28.8 km) river in Tolland County, Connecticut. It provided power for the historic Kirby's Mill in the Mansfield Hollow Historic District.
The river is a tributary of the Shetucket River, which begins where the Natchaug joins the Willimantic River, in Willimantic, Connecticut.
It runs through Natchaug State Forest and through Mansfield Hollow State Park. There is white-water rafting and other recreational use of the river.