The River Nadder rises near Tisbury draining the escarpment of the South Wiltshire Downs and Kimmeridge Clay of the Wardour Vale. The River Wylye joins the Nadder near Wilton before entering the main River Avon at Salisbury. The Nadder is well known as a mixed fishery of exceptional quality; there is a diverse array of resident species including Chub, Roach, Dace, Bream, Pike, Perch, Brown Trout and Salmon. Much of the fishing is controlled by estates and syndicates although two angling clubs offer some access to the river.