I could possibly understand Bog, Valley, Tundra, Oasis, or Isthmus as names. I’ve heard stupider names.
An isthmus is a relatively narrow strip of land separating two bodies of water, and linking two larger landmass.
An easy example is how central America has that thin bit that connected to South America before they dug the Panama canal. The Suez canal crosses another isthmus that we dug through like that.