Veidos presented an unusual landform in WoGE #422, the Köfels structure in Austria. The most obviously notable features of this, at least on a map view, are the almost circular outline and the narrow gorge the river has cut through the huge landslide deposit.
Without further ado, here is another narrow gorge:
As always, the task is to find out where it is, what it is, and post it in a comment here.
Whoever first supplies the (or "a") correct answer, gets to host the next WoGE.
Previous WoGEs are collected by Felix on his blog and a KML file, along with the "rules".