Hljóðaklettar are a bizarre looking group of crater plugs, depicting basaltic columns in different positions, creating all kind of patterns  - swirls, spirals, rosettes and honeycombs. This is what makes them unique in the world.

Hljóðaklettar (“Echo rocks” or “The Whispering Cliffs”), its name is derived from an acoustic effect and strange echoes created by the numerous caves and uncommon rock formation, making it impossible to determine the directions of the noisy rivers.