The Ganges flows more than 2,500 kilometers (1,553 miles) before reaching the Bay of Bengal. Two of its main tributaries, the Alaknanda (muddy in the picture) and Bhāgīrathi (blue in the picture) meet Devprayag, in Uttarakhand, India. 

Photograph by Asis Chatterjee, MyShot

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tributary
tributary Encyclopedic Entry

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A tributary is a freshwater stream that feeds into a larger stream, river or other body of water. The larger, or parent, river is called the mainstem.

river
river Encyclopedic Entry

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A river is a large, natural stream of flowing water. Rivers are found on every continent and on nearly every kind of land.