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The 'Little Sugar River' is a 13.5 mile long (21.7 km) river located in western New Hampshire in the United States. It is a tributary of the Connecticut River, which flows to Long Island Sound. The river flows parallel to and approximately 5 miles south of the Sugar River.
The Little Sugar River begins on a tableland in the town of Unity, New Hampshire, then drops rapidly to the west, cutting a small gorge past the north end of ''Perry Mountain'', and enters the town of Charlestown. The river reaches the Connecticut just west of the village of North Charlestown.