The spatial distribution of European capitals
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While there isn’t a strict pattern, there are some general geographical trends and patterns in the locations of the capitals of European countries.
Many European capitals are located on coastlines or along major rivers. This was historically advantageous for trade, transportation, and defense. Examples include London (UK) along the River Thames, Lisbon (Portugal) along the Atlantic coast, Rome (Italy) near the Tyrrhenian Sea, Paris (France) on the Seine, Berlin (Germany) on the River Spree, and Budapest (Hungary) on the Danube.
Several capitals are centrally located within their respective countries. This central placement can facilitate administrative and communication functions. Examples include Vienna (Austria), Brussels (Belgium), and Warsaw (Poland).
Capitals were sometimes situated in locations with natural defensive features, such as hills or mountains, making them easier to protect from invaders. Examples include Prague (Czech Republic) and Tallinn (Estonia).
Some capitals are strategically positioned near neighboring countries to facilitate diplomatic relations and cross-border activities. Examples include Vienna (Austria) and Helsinki (Finland).
All these factors, including historical ones, have influenced the spatial location of the capitals of European countries. The maps below illustrate the spatial features of the geographical location of national capitals in Europe.
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The nearest national capital in Europe
On the map below, created by @NaytaData Europe divided into regions based on the nearest national capital.

According to the map, Reykjavik is the furthest capital from any other country’s capital (distance between Reykjavik and Dublin 1,493 km). While, the distance from Vienna to Bratislava (56 km) is the shortest distance between two European capitals.
Countries centroids vs. their capitals
Despite the central placement facilitate administrative and communication functions of the capitals, the capitals of many countries are far from the geographic center. The record holder in this value is Russia. The distance from Moscow to the geographical center of Russia near Lake Vivi in Krasnoyarsk Krai is 3.122 kilometers (1940 miles).

Road distance to the nearest capital city
The map below, created by Reddit user mafmirkostt, shows Europe if borders were set according to road distance to the nearest capital city.

If you liked these maps, you may also be interested in the following maps of Europe:
could you do one with us state capitals? It is a really cool image! Or if you didn’t do a US one, could you release how you went about doing this?
That is very good
Can you please say the distance between them?