The River Tillingbourne (also known as the Tilling Bourne)[1] runs along the south side of the North Downs and joins the River Wey at Guildford.
Its source is a mile south of Tilling Springs to the north of Leith Hill at grid reference TQ143437 and it runs through Friday Street, Abinger Hammer, Gomshall, Shere, Albury, Chilworth and Shalford. The source is a semi-natural uninhabited area. The catchment is situated on sandstone which has a low rate of weathering.[2] The Tillingbourne is 24 km (15 mi) in length.[3]
The Tillingbourne initially flows northward for 4 km (2.5 mi) down the northern slopes of Leith Hill over a series of weirs and cascades, before turning west to run for 14 km (8.7 mi) through Abinger Hammer and Chilworth towards the River Wey at Shalford.[4]
The river is classified as a subsequent stream, since its course is determined by the direction of the stratum of softer rock for the majority of its length.
The river has four principal tributaries: the Friday Street stream joins at Wotton House; the Holmbury St Mary stream joins at Abinger Hammer; the Sherbourne Brook drains the Silent Pool and Sherbourne Pond and the Law Brook joins near Postford.[4]
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