The River Wey in Surrey is a tributary of the River Thames. The source of the north branch is at Alton, Hampshire an of the south branch at Liphook. The branches join at Tilford. Its tributaries are the River Tillingbourne, River Slea, Cranleigh Waters and the Stanford Brook/Hoe Stream. The Wey has a total catchment area of 904 km2, draining parts of Surrey, Hampshire and West Sussex. It joins the River Thames below Shepperton Lock near Weybridge which is named after the river.