Rapids

thumb|Rapids of Kern River, [[California, USA.]] Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence. Flow, gradient, constriction, and obstacles are four factors that are needed for a rapid to be created.

series of six whitewater rapids

Widest waterfall in Europe at 249-270 metres (817ft-886ft). Height is 1.8-2.2 metres.

thumb|250px|Imatrankoski rapids Imatrankoski (The Imatra Rapids) are rapids on the Vuoksi in Imatra, Finland. It has been a famous tourist attraction since the late 1700s. Imatrankoski is also one of the National landscapes of Finland. Since 1929, the rapids have been blocked by a dam as the Imatra hydroelectric plant began operation. Today, the dam is opened daily between June and August (Wednesday to Sunday, at 18:00) as well as on Christmas Day and New Year's Eve.

nature reserve in Ragunda Municipality, Sweden

rapids on the Dnieper River in Ukraine

Storforsen is a waterfall on the Pite River in Swedish Norrbottens län is located approximately 38 km northwest of Älvsbyn. With an average flow of 187 m3/s, the rapids are one of the most voluminous in Europe. The rapids stretch over a distance of 5 km in which it drops 82 meters 60 of which are a single waterfall.

amusement ride that simulates whitewater rafting

rapids in Kerala