Tributary, River, River system is the order from smallest to largest. A tributary, sometimes known as an affluent, is a stream or river that enters a larger stream or main stem.
What is river system?
The region drained by a river and its tributaries is known as a watershed. Rivers are enormous natural watercourses that run through channels and into larger bodies of water.
Thus, Tributary, River, River system is smallest to largest river.
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