A river is a large body of water that flows over land in long channels. Rivers are formed when water from sources such as rain, melting ice, subsoil water ot other sources gets collected in narrow strips of low lying lands and flows further down to even lower lands. If a river does not find such strips of low lying land, the water of river accumulates where such barrier to its flow is encountered, forming lakes.Rivers drain its water in other rivers sea pr big lakes.
Rivers very greatly in size which is measured in terms of its length or in terms of rate of flow of water through it. The longest river in the world is river Nile in Africa. and the biggest river in terms of flow of water is the Amazon River in South America.
The various streams that flo from the source of a river are called its headwaters. At the end of the river is its mouth where it drains into another river, lake or an ocean. Headwaters has the highest elevation point along entire course of river, and the mouth has the lowest elevation.
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