Europe is often divided into regions and subregions based on geographical, cultural or historical factors. Since there is no universal agreement on Europe's regional composition, the placement of individual countries may vary based on criteria being used. For instance, the Balkans is a distinct geographical region within Europe, but individual countries may alternatively be grouped into South-eastern Europe or Southern Europe.
Groupings by compass directions are the hardest to define in Europe, since there are a few calculations of the midpoint of Europe (among other issues), and the pure geographical criteria of "east" and "west" are often confused with the political meaning these words acquired during the Cold War era.
Some typical geographical subregions of Europe include:
Note: There is no universally agreed definition for continental subregions. Depending on the source, some of the subregions, such as Central Europe or South-eastern Europe, can be listed as first-tier subregions. Some transregional countries, such as Romania or the United Kingdom, can be included in multiple subregions.
Europe can be divided along many differing historical lines, normally corresponding to those parts that were inside or outside a particular cultural phenomenon, empire or political division. The areas varied at different times, and so it is arguable as to which were part of some common historical entity (e.g., were Germany or Britain part of Roman Europe as they were only partly and relatively briefly part of the Empire—or were the countries of the former communist Yugoslavia part of the Eastern Bloc, since it was not in the Warsaw Pact).[citation needed]
A borderless zone created by the Schengen Agreements, comprising:
Austria, Belgium, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden; in addition, by separate agreements Norway, Iceland, Liechtenstein, and Switzerland fully apply the provisions of the Schengen acquis.
A customs union of all the member states of the European Union (EU) and some neighbouring countries:
Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Monaco, the Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden. Andorra, San Marino, and Turkey are each in customs union with the EU's customs territory.
A free trade agreement among the members of the Commonwealth of Independent States: Armenia, Belarus, Kazakhstan, Kyrgyzstan, Moldova, Russia, and Tajikistan.
Albania, Austria, Belarus, Bosnia and Herzegovina, Bulgaria, Croatia, the Czech Republic, Hungary, Italy, Moldova, Montenegro, North Macedonia, Poland, Romania, Serbia, Slovakia, Slovenia, and Ukraine.
A cultural and political alliance of four Central European states for the purposes of furthering their European integration, as well as for advancing military, economic and energy cooperation with one another:
An Interreg IIIA project to establish a multinational region in Central Europe encompassing four European countries: Slovakia, Austria, Hungary, and the Czech Republic.
The Balkan Peninsula is located in Southeastern Europe and the following countries and territories occupy land within the Balkans either exclusively or partially:
The world's largest lake which forms a section of the Asian-European border has five countries occupying its shore. Iran and Turkmenistan lie entirely within Asia while the following countries are transcontinental and have sovereignty over the Caspian Sea's European sector:
Blue Banana: describing the concentration of the wealth/economic productivity of Europe in a banana-shaped band running from north west England, London, through Benelux, eastern France, western Germany to northern Italy.
^Histories 4.38. C.f. James Rennell, The geographical system of Herodotus examined and explained, Volume 1, Rivington 1830, p. 244
^Encyclopædia Britannica”, Caucasus, June 2021: “another scheme identifies the Aras River and the Turkish border as the line of continental demarcation, thereby locating Armenia, Azerbaijan, and Georgia in Europe.”