The River Avon West, Wiltshire rises around All Cannings, Wiltshire [Map] in the Vale of Pewsey being formed from many streams from where it flows past Patney, Wiltshire [Map], around Marden Henge aka Hatfield Earthworks [Map] and Wilsford Henge [Map], Rushall, Wiltshire [Map] where it joins the River Avon East, Wiltshire to form the Wiltshire River Avon.