Blå Jungfrun, also known as "Blåkulla", in English sometimes rendered literally as The Blue Maiden is a Swedish island in the Baltic Sea. It is situated in the Kalmar Strait, between the mainland province of Småland and the island province of Öland. Administratively, the uninhabited island is part of the municipality of Oskarshamn and covers an area of approximately 0.7km2 with a mean height above sea level of 86m. Home to black guillemots and a Swedish National Park since 1926, freedom to roam at Blå Jungfrun is limited with visitors prohibited from staying overnight on the island or making fires. The island consists partly of bare rock with the remainder covered in dense hardwood forest. There are several caves and an ancient stone labyrinth from which it is forbidden to remove stones. Geologically the island is an ancient inselberg rising from the Sub-Cambrian peneplain. After its formation in the Precambrian time Blå Jungfrun was buried in sandstone being shielded for erosion. It was freed from its sandstone cover in geologically recent times.
