The opposite of a tributary is a distributary. Distributaries, where rivers branch off to form smaller streams, are probably the most familiar features of deltas. Here, The Chilkat River forms several distributaries before emptying into the Pacific Ocean near Wells, Alaska.

Photograph by Michel Hammann, 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.

delta
delta Encyclopedic Entry

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Deltas form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river.