Allogenic River

Allogenic River

 

A river is said to be allogenic if its hydrologic regime does not correspond to the physicogeographic conditions of the territory through which it flows, since the hydrologic regime is determined elsewhere. The characteristics of an allogenic river show up especially clearly when the river crosses a desert. An allogenic river floods the desert in the summer. Such floods are due to the summer melting of snow in mountains, as is the case with the Amu Darya, or to summer rains in savanna zones, as is the case with the Nile.

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