The River Leen is a 15-mile (24 km) long tributary of the River Trent that flows through Nottinghamshire, and the city of Nottingham in the East Midlands of England. The name Leen developed through various renderings of the Celtic word meaning "lake" or "pool" (Llyn in modern Welsh). Some of the surrounding villages derived their name from the River Leen. Lenton, ton being the Saxon word for "village"; and Linby, by being the Danish equivalent of ton.