The River Wey is a tributary of the River Thames in south east England and one of two major tributaries in Surrey. The name may be derived from the Old English word Éa meaning "river". It begins as two branches rising outside the county which join at Tilford between Guildford and Farnham. Once combined the flow is eastwards then northwards via Godalming and Guildford to meet the Thames while in Surrey. The main sub-tributary is the Tillingbourne flowing from the western slopes of Leith Hill in Surrey westwards to a point just south of Guildford between the main village of Shalford and the hamlet of Peasmarsh. Downstream the river forms the backdrop to Newark Priory and Brooklands.