Lazy river
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A lazy river is a water ride found in many amusement parks or water parks. It usually consists of shallow (2 1/2 ft. to 3 1/2 ft.) pool that flows similarly to a river. There is generally a slow current, usually just enough to allow guests to gently ride along laying on rafts. There may also be scenic elements added, such as small waterfalls on the edge of the river. Some lead into wave pools, while some just go around in circles.
A torrent river, or wave river, is a related concept. Torrent rivers feature wave machines similar to those that are in wave pools; the waves then push riders (who are on rafts, as they are in a regular lazy river) around the river faster than they would be traveling in a regular lazy river. Torrent rivers appear at all of the Schlitterbahn water parks.