Before revision: These gates have been permanently open since nationalisation.Birmingham's Canals, Ray Shill, 1999, 2002, Round locks Agde Round Lock The best known example of such a round lock is the Agde Round Lock on the Canal du Midi in France.
After revision: These gates have been permanently open since nationalisation.Birmingham's Canals, Ray Shill, 1999, 2002, Round locks Agde Round Lock The best known example of a round lock is the Agde Round Lock on the Canal du Midi in France.