Tags: Lighthouse, Tower.
Söderarm is the name of a Swedish lighthouse station and its surrounding small archipelago in the west part of the sea of Åland. The light station is located on the island of Thorskär. This area together with the tiny island of Tjärven north of Söderarm marks the entrance for the shipping route leading to the ports of Kapellskär Norrtälje and also the north entrance to Stockholm.
