During the Silurian period (444 – 416 million years ago), Sweden was quite close to the equator, which has resulted in the remains of several large reefs in the Silurian bedrock on Gotland. The bedrock on Gotland testifies to the deposition of sediments (which then formed the calcareous bedrock) into a shallow tropical sea.

The mighty seastack have been formed by erosion – wind, water, waves, gravitational movements and living organisms.

At Langhammars you will find the largest and highest seastacks and on the road out to Langhammars seastack area you will find a landscape that reminds you of the pictures you have seen from first steps on the moon by Neil Armstrong.