The 100-hectare (250-acre) reserve, formerly a Domänreservat (protected by the Swedish government forestry agency), is part of the Böda Kronopark.Trollskogen is characterized by its lichen-covered pine trees; those close to the exposed shore (a shingle beach) have been deformed by the wind.Today, cattle still graze here, ensuring the biodiversity of the ecosystem, native grass and herb diversity.The rich flora of the reserve includes endangered and rare species such as Pachyphiale carneola, Calicium abietinum, and Sphinctrina.Grankullavik, formerly called Örboviken, was a naval base in the 15th century, dominating much of the central Baltic Sea.