Source of the River Wey

The River Wey in Surrey, Hampshire and West Sussex is a tributary of the River Thames with two separate branches which join at Tilford. The source of the north branch is at Alton, Hampshire and of the south branch at both Blackdown south of Haslemere, and also close to Gibbet Hill, near Hindhead (the south branch splits into two smaller rivers). The Wey has a total catchment area of 904 square kilometres (350 sq mi), draining parts of Surrey, Hampshire and West Sussex.

It is partly navigable from Godalming, forming the natural part of the Wey and Godalming Navigations. It joins the River Thames near Weybridge, which is named after the river, just downstream of Shepperton Lock. The river is also a popular subject to study, as its features allow for easy access to data.