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Stream capture, river capture, river piracy or stream piracy is a geomorphological phenomenon occurring when a stream or river drainage system or watershed is diverted from its own bed, and flows instead down the bed of a neighbouring stream. This can happen for several reasons, including:
The additional water flowing down the capturing stream may accelerate erosion and encourage the development of a canyon (gorge).
The now-dry valley of the original stream is known as a wind gap.
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