Fact box

Surf's up in the sea ... and also a Chinese river

The Red Bull Qiantang Surfing Shootout is the first international river surfing competition.

Surfing in a river is quite different from surfing in the sea. The height and the speed of river waves are not as high but a tidal bore can run for more than 10 kilometers. It requires good jet ski driving skills for surfers to chase the tidal bore and find a wave to surf.