@saab,
Westeurope is what we call the countries which never were under the Eastblock after WWII. France, Germany, Belgium, Luxembourg, Nederland, Aurstria, Switzerland, Liechtenstein og Monaco.
Before WWII it was about the same countries which at that time and even earlier were called Central Europe.
Northern Europe is the northern part or region of Europe. Northern Europe typically refers to the seven countries in the northern part of the European subcontinent which includes Denmark, Estonia, Latvia, Lithuania, Norway, F Faroe Islands and Greenland, Åland Islands, Iceland, Ireland
Norway Svalbard and Jan Mayen
United Kingdom
Guernsey
Isle of Man
Jersey
Also it includes the countries parts of Central Europe which has borders to the Baltic Sea, Nordsea and English Channel