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The Rhine Falls (Rheinfall in Switzerland ) are the largest plain waterfalls of Europe. They are located in the High Rhine upper course of the river Rhine, in the municipalities of Neuhausen am Rheinfall and Laufen-Uhwiesen, near the town of Schaffhausen in northern Switzerland and close to the German border. They are 150 m (450 ft) wide and 23 m (75 ft) high. In the winter months, the average water flow is 250 m³/s, while in the summer, the average water flow is 700 m³/s. The highest flow ever measured was 1,250 m³/s in 1965; and the lowest, 95 m³/s in 1921. The Rhine Falls were formed in the last ice age, approximately 14,000 to 17,000 years ago, by erosion- resistant rocks narrowing the riverbed. The falls cannot by climbed by fish, except by eels that are able to worm their way up over the rocks.