 It is located on the mountain of Sornfelli above the fjord of Kalbaksfjørður.The buildings in Mjørkadalur used to be part of the Island Command Faroes, but now a part of the building is used as a detention centre for prisoners who serve short sentences.Criminals from the Faroe Islands who serve longer sentences are sent to prisons in Denmark, as there is no prison in the Faroe Islands, only the detention centre, which has room for 12 persons.