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1.
Is a complete geographical phenomenon / formation
2.
Borders the Baltic Sea
3.
Includes Mainland Sweden
4.
Includes a part of Finland
5.
Includes Mainland Denmark
6.
Includes 3 sovereign nations
8.
Includes a part of Russia
9.
Has an area of around 750,000km²
10.
Includes a part of Northern Germany, the state of Schleswig-Holstein..etc
11.
Includes the Åland Islands
12.
Has a larger surface area (Not including outside territories, like Greenland...etc)
13.
Included sovereign nations has more official languages (Not including dialect, or languages spoken in outside territories)