Continent

•  Europe (1)

Land

•  Denmark (8)
•  Finland (7)
•  Germany (9)
•  Norway (4)
•  Poland, Baltic states (5)
•  Russia (1)
•  Sweden (9)

Seas

•  Adriatic Sea (3)
•  Baltic Sea (9)
•  Gulf of Bothnia (2)
•  Gulf of Finland (2)
•  Irish Sea (1)
•  Mediterranean Sea (14)
•  North Sea (5)
•  Wadden Sea (3)