The Itchen Navigation is a 10.4-mile (16.7 km) disused canal system in Hampshire, England, that provided an important trading route from Winchester to the sea at Southampton for about 150 years. Improvements to the River Itchen were authorised by Act of Parliament in 1665, but progress was slow, and the navigation was not declared complete until 1710. It was known as a navigation because it was essentially an improved river, with the main river channel being used for some sections, and cuts with locks used to bypass the difficult sections. Its waters are fed from the River Itchen.