Sticking out like a castle on the sea, the dikes are what is left of a sunken volcanic crater. Best seen from a viewpoint a couple of kilometres away.
Sources and licences
Guide text adapted from the Wikivoyage article "Snæfellsjökull National Park" by its contributors, available under CC BY-SA 4.0. Read on Wikivoyage · Contributors · CC BY-SA 4.0
