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The smaller stream is a tributary of a larger stream, river or lake.
Other streams or lakes that joins a main river is a tributary
The Snake River is a major tributary of the Columbia River in the U.S.
The small river acted as a tributary to the main channel.
Creek
The join of a small river (a tributary) joins a larger river (the main river) is called a confluence.
A tributary, it contributes to the flow of the main river. kool-Aid grape slurpy
It is called a tributary
actually there is no Yakima river its actually a tributary that's connected to the Columbia River in Washington state.
A tributary.
A Tributary
A tributary contributes its water to the main river. For example Mandakini is the tributary of Alak Nanda river in greater Himalayas. Alak Nanda and Bhagirathi are two main rivers of the mighty river Ganges of India.