Famous Qiantang River Tidal Bore in China
Tidal bores only occur in an estimated 100 rivers in the world, the largest being on the Quiantag River, and known as “The Silver Dragon”. It can reach a height of 29.2 feet (8.9 meters) and a speed of 25 miles an hour (40 kilometers an hour). It is so dangerous that no one has managed to surf it for more than 11 seconds.