The Lane River begins at the outlet of Kezar Lake in the village of North Sutton. The river flows south through a broad wetland, incorporating the outflow of Gile Pond, then suddenly drops 140 feet (43 m) in 0.3 miles (0.5 km) to enter the village of Sutton. The river continues southeast through more wetlands and past the village of South Sutton, then becomes more rapid as it descends to the Warner River at the Sutton/Warner town line.