The Strépy-Thieu boat lift, on the Canal du Centre, Hainaut, Belgium, uses a counterweight system to carry boats a vertical distance of 73.15 m (240 ft) from its upstream and downstream sections. The two boxes or caissons, that each boat enters are 112 x 12 m (367 x 39 ft), and weight between 7,200 and 8,400 tonnes, depending on the current water level. It takes seven minutes for the vertical journey to be completed.