These locks constitute a remarkable hydraulic junction. It is the point of convergence of the main rivers of the Marais Poitevin where Deux-Sèvres, Charente-Maritime and Vendée meet. Several locks form this exceptional and ingenious hydraulic junction allowing the management of water in the Marais. You will find in Bazoin the only pier allowing to make the junction between the Charente-Maritime and the wet marsh (Venise Verte).