The Rhine Falls (German: Rheinfall, singular) is a waterfall located in Switzerland and the most powerful waterfall in Europe. The falls are located on the High Rhine on the border between the cantons of Schaffhausen (SH) and Zürich (ZH), between the municipalities of Neuhausen am Rheinfall (SH) and Laufen-Uhwiesen/Dachsen (ZH), next to the town of Schaffhausen in northern Switzerland. They are 150 metres (490 ft) wide and 23 metres (75 ft) high. In the winter months, the average water flow is 250 m3/s (8,800 cu ft/s), while in the summer, the average water flow is 600 m3/s (21,000 cu ft/s). The highest flow ever measured was 1,250 cubic metres per second (44,000 cu ft/s) in 1965; and the lowest, 95 cubic metres per second (3,400 cu ft/s) in 1921. The falls cannot be climbed by fish, except by eels that are able to worm their way up over the rocks.