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The counterweight system of the shadoof is an early example of the engineering of river water. In pre-industrial society, rivers were a source of transportation and abundant resources. [19] [26] Many civilizations depended on what resources were local to them to survive.
Dendritic drainage: the Yarlung Tsangpo River, Tibet, seen from space: snow cover has melted in the valley system. In geomorphology, drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of land, whether a particular region is ...
However, the path along the river's deepest point is fractal in the same way that the coastline is. Even when detailed maps are available, the length measurement is not always clear. A river may have multiple channels, or anabranches. The length may depend on whether the center or the edge of the river is measured.
A definition given by the state of Montana agrees, stating that a river source is never a confluence but is "in a location that is the farthest, along water miles, from where that river ends." [3] Under this definition, neither a lake (excepting lakes with no inflows) nor a confluence of tributaries can be a true river source, though both often ...
A river valley civilization is an agricultural nation or civilization situated beside and drawing sustenance from a river. A river gives the inhabitants a reliable source of water for drinking and agriculture. Some other possible benefits for the inhabitants are fishing, fertile soil due to annual flooding, and ease of transportation.
Slaney: Irish meaning "river of health" Tay: Celtic river goddess Tawa (Tava, Tatha, "the silent one") [7] Tambre: From Tamaris with the same root that Tamar. Thames: Latin Tamesis from Brythonic meaning "dark river" The Thame and Tamar, and probably the three rivers called Tame, have a similar etymological root; Tyne: Brythonic meaning "river"
List of rivers of Montserrat; List of rivers of Puerto Rico; List of rivers of Saint Kitts and Nevis; List of rivers of Saint Lucia; List of rivers of Saint Martin (France) List of rivers of Saint Pierre and Miquelon; List of rivers of Saint Vincent and the Grenadines; List of rivers of Trinidad and Tobago; List of rivers of the United States ...
Since rivers often serve as political boundaries, confluences sometimes demarcate three abutting political entities, such as nations, states, or provinces, forming a tripoint. Various examples are found in the list below. A number of major cities, such as Chongqing, St. Louis, and Khartoum, arose at confluences; further examples appear in the list.