Blå Jungfrun ("[the] blue virgin" or "[the] blue maid[en]"), or "Blåkulla" ("Blockula"), is a Swedish island in the Baltic Sea. More precisely, it is situated in the Kalmar Strait, between the mainland province of Småland and the island/province of Öland. Administratively, it belongs to the municipality Oskarshamn. It is uninhabited and has an area of only about 0.7 km², though it rises 86 metres above sea level.