Whitewater forms in the context of rapids, in particular, when a river's gradient changes enough to generate so much turbulence that air is trapped within the water. This forms an unstable current that froths, making the water appear opaque and white.
The term "whitewater" also has a broader meaning, applying to any river or creek that has a significant number of rapids. The term is also used as an adjective describing boating on such rivers, such as whitewater canoeing or whitewater kayaking.
Kayaking is the use of a kayak for moving over water. It is distinguished from canoeing by the sitting position of the paddler and the number of blades on the paddle. A kayak is a low-to-the-water, canoe-like boat in which the paddler sits facing forward, legs in front, using a double-bladed paddle to pull front-to-back on one side and then the other in rotation. Most kayaks have closed decks, although sit-on-top and inflatable kayaks are growing in popularity as well.
The Cataracts of the Nile are shallow lengths (or whitewater rapids) of the Nile river, between Khartoum and Aswan, where the surface of the water is broken by many small boulders and stones jutting out of the river bed, as well as many rocky islets. In some places, these stretches are punctuated by whitewater, while at others the water flow is smoother but still shallow.
Outdoor literature is a literature genre about or involving the outdoors. Outdoor literature encompasses several different subgenres including exploration literature, adventure literature and nature writing. Another subgenre is the guide book, an early example of which was Thomas West's guide to the Lake District published in 1778. The genres can include activities such as exploration, survival, sailing, hiking, mountaineering, whitewater boating, geocaching or kayaking, or writing about nature and the environment. Travel literature is similar to outdoor literature but differs in that it does not always deal with the out-of-doors, but there is a considerable overlap between these genres, in particular with regard to long journeys.
The Urubamba River or Vilcamayo River (possibly from Quechua Willkamayu, for "sacred river") is a river in Peru. Upstream it is called Vilcanota River (possibly from Aymara Willkanuta, for "house of the sun"). Within the La Convención Province, the name changes to Urubamba. A partially navigable headwater of the Amazon River, the Urubamba rises in the Andes to the southeast of Cusco. It originates on the slopes of Cunurana in the Puno Region, Melgar Province, near the La Raya pass. It flows north-north-west for 724 km (450 mi) before coalescing with the Tambo River to form the Ucayali River.
The Urubamba is divided into the Upper Urubamba and the Lower Urubamba, the dividing feature being the Pongo de Mainique, an infamous whitewater canyon, where the river narrows to a width of 45 metres (148 ft).
The Peshtigo River (/ˈpɛʃtɪɡoʊ/ PESH-ti-go) is a 136-mile-long (219 km) tributary of Green Bay in the U.S. state of Wisconsin. The Peshtigo Fire happened in the river's vicinity, and some survivors used the river for refuge from the flames. A section of whitewater on the river called the Roaring Rapids is well known in the region. Further downstream there are two dams known as Caldron Falls Dam and High Falls Dam before collecting the Thunder River.
Rafting and whitewater rafting are recreational outdoor activities which use an inflatable raft to navigate a river or other body of water. This is often done on whitewater or different degrees of rough water. Dealing with risk is often a part of the experience.
This activity as an adventure sport has become popular since the 1950s, if not earlier, evolving from individuals paddling 3 metres (9.8 ft) to 4.3 metres (14 ft) rafts with double-bladed paddles or oars to multi-person rafts propelled by single-bladed paddles and steered by a person at the stern, or by the use of oars.