Middelgrundsfortet or Fort Middelgrund, known as Ungdomsøen (The Youth Island)[1][2] since 2015,[3] is a sea fort located on an artificial island in the Øresund between Copenhagen and Malmö. The fortress is constructed at a point where the seabed is 7 meters below the water surface, and at the northern meeting point of the straits Kongedybet and Hollænderdybet.
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ICYEwas invoked but never defined (see the help page). - ^ "Welcome to Ungdomsøen". Ungdomsøen.dk. 2019. Archived from the original on 24 August 2019. Retrieved 27 August 2019.
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Altingetwas invoked but never defined (see the help page).