The River Avon is a river in the south of England. The river rises in the county of Wiltshire and flows through the city of Salisbury and the county of Hampshire before reaching the English Channel through Christchurch Harbour in the county of Dorset. It is sometimes known as the Salisbury Avon or the Hampshire Avon in order to distinguish it from the various other River Avons in England. It is one of the rivers in Britain in which the phenomenon of anchor ice has been observed. The Avon is thought to contain more species of fish than any other river in Britain.