Karren is a general term, originating from German, to describe a number of small-scale solution features on the surface of limestone. Karren are frequently found on limestone pavements, and formed subaerially (beneath the soil). Some are ancient, predating the last ice ages, and some may even be millions of years old. coughcoughkaren*cough

i thought you were gonna say "because you encounter them often" or smth

i swear this is the most underrated opinion ever