[1] It is a tributary of the Connecticut River, which flows to Long Island Sound.

The river flows parallel to and approximately 5 miles (8 km) south of the Sugar River.

The Little Sugar River begins on a tableland in the town of Unity, then drops 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.

This article related to a river in New Hampshire is a stub.