The United Kingdom (UK)
British, Briton, Brit (informal)

England
English

Scotland
Scotish

Wales
Welsh

Ireland
Irish

France
French, Frenchman

Germany
German

Spain
Spanish

Portugal
Portuguese

Italy
Italian

Switzerland
Swiss

Belgium
Belgian

The Netherlands
Dutch

Austria
Austrian

Poland
Polish

Romania
Romanian

Russia
Russian

Norway
Norwegian

Sweden
Swede, Swedish

Finland
Finnish, Finn

Denmark
Danish

Iceland
Icelander, Icelandic

Nordic countries
Nordic

Scandinavia
Scandinavian

Czech Republic
Czech

Slovakia
Slovakian

Greece
Greek

Turkey
Turkish

Hungary
Hungarian

Albania
Albanian

Belarus
Belarusian

Bosnia and Herzegovina
Bosnian, Herzegovinian

Bulgaria
Bulgarian

Croatia
Croatian

Cyprus
Cypriot

Estonia
Estonian

Latvia
Latvian

Lithuania
Lithuanian

Baltic countries
Baltic

Luxembourg
Luxembourgers

Macedonia
Macedonian

Moldova
Moldovan

Montenegro
Montenegrin

Serbia
Serbian

Slovenia
Slovenian

Ukraine
Ukrainian

Malta
Maltese

London

Paris

Amsterdam

Berlin

Rome

Madrid

Barcelona

Hamburg

Warsaw

Budapest

Bucharest

Moscow

Istanbul

Mediterranean sea, Mediterranean

Baltic sea

North sea

Black sea

Holland