Qiantang River in China has a river bore (tide) that peaks every fall attracting tourists and surfers. This year the bore is especially high because of Typhoon Dajuan. The tidal bore travels approx. 25km and will take you one hour to surf it if you can surf the entire length.
CCTV video shows the crashing waves from the tidal bore at the shoreline. http://www.cctv-america.com/2015/09/29/east-china-registers-largest-tidal-bore-in-years