Land

•  Denmark (2)
•  Finland (5)
•  Germany (2)
•  Norway (1)
•  Poland, Baltic states (2)
•  Russia (1)
•  Sweden (4)

Seas

•  Baltic Sea (15)
•  Gulf of Bothnia (2)
•  Gulf of Finland (2)
•  IJsselmeer (1)
•  Irish Sea (1)
•  North Sea (18)
•  Wadden Sea (3)