Middelgrundsfortet or Fort Middelgrund, known as Ungdomsøen (The Youth Island) since 2015, 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. Christian IX's government constructed the fort between 1890–94 to serve as a part of Copenhagen's coastal fortifications, partly using material excavated from Frihavnen. It is one of three artificial islands that were created to defend the entrance to Copenhagen's harbour. (The other two are Flakfortet and Trekroner Fort.) More information...
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