A large wave, or series of waves, that travels up a river or narrow bay against the current's usual direction, formed where an incoming tide funnels into a shallow, narrowing channel with enough force to overcome the river's outflow. The wave typically arrives as a distinct wall of turbulent water, sometimes several feet high, and can travel many miles upstream twice daily with the tidal cycle. China's Qiantang River hosts the largest recorded tidal bore, with a leading wave that has reached over nine meters in height and draws visitors every year.
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