Tributary
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A tributary, or an affluent, is a stream that typically flows into a larger stream or lake, or rarely into a smaller stream, e.g., the Esla tributary to the Douro. A tributary does not flow directly i
Nam Khan flows into the Mekong at Luang Prabang in Laos.
At Harpers Ferry, West Virginia, looking downstream, the Shenandoah River (bottom right) meets the Potomac River, which flows from bottom left to top right, making the Shenandoah a right tributary of the Potomac.
Huai River (itself a tributary of the Yangtze) and tributaries
![The Mekong is a trans-boundary river, originating in the Tibetan Plateau. Its upper tributary river systems (e.g. ngom chu [zh]) are restricted to nar](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Mekongbasin.jpg/500px-Mekongbasin.jpg)
The Mekong is a trans-boundary river, originating in the Tibetan Plateau. Its upper tributary river systems (e.g. ngom chu [zh]) are restricted to narrow gorges, but the tributaries that feed its lower reaches (e.g. the Mun River) cover larger areas.
Esla (river)
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The Esla is a river in the provinces of León and Zamora in the northwest of Spain. It is a tributary of the Duero River that starts in the Cantabrian Mountains and is 275 kilometres long. Its directio
Tributary
…tributary, or an affluent, is a stream that typically flows into a larger stream (main stem or parent) or lake, or rarely into a smaller stream, e.g., the Esla tributary to the Douro. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem into which they flow drain the surrounding…
View of the Esla River