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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.
The valley of Halikko River in Halikko, Finland Valley of Palakaria river springing from Vitosha Mountain, seen in the background, in Bulgaria. The development of a river valley is affected by the character of the bedrock over which the river or stream flows, the elevational difference between its top and bottom, and indeed the climate.
There is archeological evidence that mass ritual bathing in rivers at least 5,000 years ago in the Indus river valley. [19] While most rivers in India are revered, the Ganges is most sacred. [31] The river has a central role in various Hindu myths, and its water is said to have properties of healing as well as absolution from sins. [19]
Rivers get their alluvium from erosion, which carves rock into canyons and valleys. Rivers have sustained human and animal life for millennia, including the first human civilizations. The organisms that live around or in a river such as fish, aquatic plants, and insects have different roles, including processing organic matter and predation.
The valley grew during and following the ice age. Many small rivers were altered or abandoned after the upper Ohio River formed. Valleys of some abandoned rivers can still be seen on satellite and aerial images of the hills of Ohio and West Virginia between Marietta, Ohio, and Huntington, West Virginia.
72 Interior River Valleys and Hills (along the State boundary rivers and into the interior along the Illinois River, also the broad somewhat hillier southern and western till plains) 72a - Wabash-Ohio Bottomlands; 72b - Glaciated Wabash Lowlands; 72d - Upper Mississippi Alluvial Plain; 72e - Middle Mississippi Alluvial Plain; 72f - River Hills
A few major rivers, including the Delaware River, the Susquehanna River, the New River, and the Potomac River, are older than the present mountains, having cut water gaps that are perpendicular to hard strata ridges. The evidence points to a wearing down of the entire region to a low level with little relief, so that major rivers were flowing ...
Most of the rivers in India originate from the four major watersheds in India. The Himalayan watershed is the source of majority of the major river systems in India including the three longest rivers–the Ganges, the Brahmaputra and the Indus. [3] [4] These three river systems are fed by more than 5000 glaciers. [5]