river surfing

A stationary or "standing" river wave suitable for surfing can form given the right water flow and a suitable bottom configuration—usually a ledge or a submerged group of boulders. River surfing is sometimes grouped with tidal bore surfing since both take place in a river, but the tidal bore is a single wave or set of waves that moves upstream during a tidal surge, while a river wave is a type of rapid.

Kayakers have been riding river waves since the 1970s; surfers jumped in during the mid-1...