karren German term describing the group of solutional features developed at the surface of an outcrop of hard limestone. Forms range from runnels (shallow troughs) a few millimetres deep to fissures (grikes) extending several metres into the limestone. The word is sometimes used as a synonym of lapiés.

karren The German name for a group of solutional features developed at the surface of an outcrop of hard limestone. Forms range from runnels (shallow troughs) a few millimetres deep to fissures (grikes) extending several metres into the limestone.