A watershed is a area of water that flows from high emptying into a larger body of water

A source is a beginning point of a body of water .

An area formed from the  deposition of sediments at the mouth of a river .

The Great Basin is a watershed where the water does not flow to the ocean .                

The beginning of a river is called headwaters some come from underground streams but most come from the mountains snow    

A  down river is between headwaters and floodplains .

A stream or river which flows into a mainstream .

A confluence is a place where two rivers meet .  

A floodplain is the relatively flat land adjacent to the river to channel that is underwater when the river floods .

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