The River Glen is a waterway located in Lincolnshire, England, originating from Rospley. The navigable section for paddling, suitable for canoeing, kayaking, and stand-up paddleboarding, runs for 11.5 miles (18.5 kilometers) from Tongue End. A licence is required to paddle on the river, and obtaining one provides free access to designated launch points. The river's character is defined by this relatively long, flat-water section, offering a substantial day trip for recreational paddlers. The first 8 miles of the navigable stretch are particularly noted for their suitability. The landscape is typical of Lincolnshire, with agricultural surroundings influencing the waterway's aesthetic. Paddlers must plan their trip with the licensing requirement as a primary consideration, and the length of the navigable section suggests a full-day outing is feasible.