Towers completed in 1770

Grönskär (eng: The Green skerry) is a Swedish island and lighthouse station located in the south Stockholm archipelago, east of Sandhamn. The island is rocky and the nature sparse. The herb cloudberry has been found on the island. The whole island is owned by the Swedish foundation "Skärgårdsstiftelsen" (eng: The Archipelago foundation). since 1964. The foundation also owns the lighthouse since 1984.