Bewl Water is a reservoir in the valley of the River Bewl, straddling the boundary between Kent and East Sussex in England. It is about 2 miles (3.2 km) south of Lamberhurst, Kent. The reservoir was part of a project to increase supplies of water in the area. It supplies not only Southern Water’s customers in the Medway towns, Thanet and Hastings, but is also used by other water companies in the area.