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A tidal bore is an inrush of water with a wavelike front that advances up a river or narrow bay, against the current, with considerable force and velocity. It is caused by the progress of an incoming tide from a wide-mouthed bay into its narrower portion and occurs in relatively few places in the world. The largest, China’s Qiantang River bore, can reach 30 ft (9 m) in height and travel as fast as 25 mph (40 km/h). Although dangerous, bores are sought out by athletes who engage in what sport? Discuss
Source: The Free Dictionary