A river is a stream of water that flows across the land and empties into another body of water.
 

The source of a river may be a lake, a spring, or a bunch of small streams, known as headwaters. From their source, all rivers flow downhill, usually ending in the ocean.

The mouth of a river is known as its base level. A river's water is normally within a channel, made up of a stream bed between banks.

Most rainfall on land passes through a river on its way to the ocean. Smaller side streams that join a river are tributaries.

The scientific term for any flowing natural waterway is a stream; so the term river is just another way to say large stream.

 

The 4 largest rivers on earth:

  1. Nile (Egypt) (6,690 km)
  2. Amazon (South America) (6,452 km)
  3. Yangtze (China) (6,380 km)
  4. Mississippi-Missouri (USA)
    (6,270 km)
 

Related Terms
dam - built across a river for water control
mouth - where a river empties into the ocean or a lake
tributary - smaller streams or river that flow into a larger river
ocean - a river flows toward this point
river basin - the land that is drained by a river
source - the beginning of a river (usually in the mountains)
estuary - where the river water meets ocean water
 
 
 
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