Hacker News new | past | comments | ask | show | jobs | submit login

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).

Registration is open for Startup School 2019. Classes start July 22nd.

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact