Tjärven is the name of a small island and light station surrounded by deep water and located in the sea of Åland, north of the Söderarm archipelago of the coast of Sweden.

The lighthouse functions as the entrance to the shipping route for the ports of Kapellskär, Norrtälje and Stockholm.

Initially, there was a decision to remove the lantern room and replace it with a mast, but this proved too hard to accomplish.

SMA has confirmed that many Russian mines dating from the first world war may still lie on the bottom of the sea east of the light station, making anchoring or diving dangerous in the area.

And the areas surrounding it is heavily trafficked by the cruise ships plying between Sweden and Finland.