The Volkeraksluizen are a complex of three locks, for professional shippinl, side by side, four sluices and a yacht lock, located in the Volkerakdam between the Hollands Diep and Volkerak near Willemstad. The waterway is an important link in the Schelde-Rhine Canal and is CEMT-class VIb. The locks are the biggest inland locks of Europe and based on passing tonnage (over about 240 million tonnes), the largest inland locks in the world.