 Here the stop lock consists of two opposing lock gates at each end of a lock so that a boat could move from one canal to the other with a minuscule amount of water loss, and no water flow, no matter which canal happened to be the higher at any particular time.Today the gates are chained open as the two canals are under common control.The adjacent Banana Warehouse with its overhanging canopy is so named as it was once owned by Geest.