Subregions- Austria
 - Austria region
- Baltic Sea
- Bay of Biscay
- Belgium
- Bristol Channel region, United Kingdom
- Channel Islands region, United Kingdom
- Czech Republic
- Denmark
- England, United Kingdom
- France
- France-Germany border region
- Germany
- Gotland, Sweden
- Hungary
- Ireland
- Irish Sea
- Liechtenstein
- Luxembourg
- northern Ireland, United Kingdom region
- northern Italy
- North Sea
- Orkney Islands region, United Kingdom
- Poland
- Poland-Belarus border region
- Poland-Belarus-Ukraine border region
- Poland-Ukraine border region
- Scotland-England region, United Kingdom
- Scotland, United Kingdom
- Shetland Islands region, United Kingdom
- Slovakia
- southern Norway
- Sweden
- Switzerland
- The Netherlands
- United Kingdom
- Wales-England region, United Kingdom
- Wales region, United Kingdom
- Wales, United Kingdom
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