"Stream capture", a/k/a "river capture" or "river piracy" is A Thing: <https://en.wikipedia.org/wiki/Stream_capture https://en.wikipedia.org/wiki/Stream_captur

"Stream capture", a/k/a "river capture" or "river piracy" is A Thing: <https://en.wikipedia.org/wiki/Stream_capture https://en.wikipedia.org/wiki/Stream_capture> We know that rivers change courses, and there are both known and unknown instances of this. Edit: "capture" above originally read "crapture".