River Wylye

The River Wylye is a chalk stream in the south of England, with clear water flowing over gravel. It is popular with anglers for fly fishing. A half-mile stretch of the river and three lakes in Warminster are a local nature reserve.
The Wylye rises below the White Sheet Downs just south of Maiden Bradley in south-west Wiltshire, then flows north through the Upper Deverills. A tributary which feeds the man-made Shearwater lake joins near Crockerton. On the southern edge of Warminster the river turns to head generally east south east, running through the Mid Wylye Valley, into which the A36 road and the Wessex Main Line are also squeezed. The river passes through or touches the parishes of Bishopstrow, Norton Bavant, Heytesbury, Knook, Upton Lovell, Boyton, Codford, Stockton, Wylye and Wilton, near the southern edge of Salisbury Plain. At Wilton, it comes to an end, running into the River Nadder, which itself flows into the Hampshire Avon. That eventually drains into the English Channel at Christchurch.

Wikipedia