3 ms·

ahem https://en.wikipedia.org/wiki/Lost_streams_of_Idaho https://en.wikipedia.org/wiki/Lost_streams_of_Idaho

• maaark 8y ago
  underground is somewhere...
  • cimmanom 8y ago
    But does it show up on a map?
    • wtracy 8y ago
      No, but they ultimately feed into a river that does. My opinion: Features like this have no business being in a fantasy map unless the author has an above-average grasp of geology. Or there's a magic portal somewhere. That's fine, just don't pretend it's natural.