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Similar situation for the Popo Agie River near Lander, Wyoming. Only it resurfaces soon after going underground.

[1] https://en.wikipedia.org/wiki/Sinks_Canyon_State_Park




This pattern is fairly common when there is karstic geology, but also happens in other cases: https://en.wikipedia.org/wiki/Subterranean_river

I don't know how common seasonal variation is (per the other comment about the Danube doing a similar thing to the French river).




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