It has become increasingly clear over the last two years that ever more areas are identifying themselves as a part, including southern Sweden, eastern Denmark and northern Germany.  Thus, the region contains the Danish Capital Region, Region Zealand, Schleswig-Holstein, Hamburg, Northwestern Mecklenburg-Western Pomerania (including the districts of Rostock, Wismar, Bad Doberan, Güstrow and Northwest Mecklenburg) and well as Scania County in Sweden.

The Fehmarnbelt region comprises a total of 60,895 square kilometres (including all of Mecklenburg-Western Pomerania).  Of this, 65% of the region is German, 16% Danish and 19% Swedish.