It comprises the western (Atlantic) part of Iberia, north and western France, Ireland and the United Kingdom. Some authors also include Iceland, the Low Countries, north Germany and Scandinavia.
Weather and overall physical conditions are relatively similar along this area (with the exception of parts of Scandinavia and the Baltic), resulting in similar landscapes with common endemic plant and animal species. From a strictly physical point of view most of the Atlantic European shoreline can be considered a single biogeographical region. Physical geographers label this biogeographical area as the European Atlantic Domain, part of the Euro-Siberian botanic region.
Some examples of early cultural contact are the European Megalithic Culture and the Atlantic Bronze Age, or "carp's tongue sword complex". This refers to an industry mainly based on the west coast of France and Brittany but which clearly had links with societies in Iberia and Britain, as evindenced by products such as the carp's tongue sword and the end winged axe, which were widely bought and sold along the routes of the Atlantic seaways.
Atlantic Europe is also a term often used in reference to the territory occupied by the Celtic peoples of western Europe.
A number of authors have postulated that there still is a cultural continuum in Atlantic Europe, forming a cultural unit which has its roots in prehistoric times but remained until today mostly thanks to sea trade. Geographers also mention the influence of the natural environment in the construction of a similar cultural landscape along the western European coasts. Some of the first geographers to consider this idea of Atlantic Europe were geographers Otero Pedrayo and Orlando Ribeiro. Pedrayo stated in his studies about Galicia that this territory was marked by a strong "Atlantic character", not Mediterranean, despite the fact of being part of a Mediterranean State (Spain). On the other hand, while researching about his native Portugal, Ribeiro deepened in the concepts of Atlantic Europe and Mediterranean Europe, linking central and southern Portugal to the Mediterranean culture and northern Portugal (together with Galicia) to a pan-Atlantic European culture.
This idea would be further developed from the 1950s onwards by authors such as P. Flatrès, Emyr Estyn Evans, A. Bouhier, Meynier, J. García Fernández, Patrick O'Flanagan, Barry Cunliffe, Carlos Ferrás Sexto and Xoán Paredes (among others). Patrick O'Flanagan, based on the theories of Pedrayo and Ribeiro, states that Atlantic Europe is a cultural reality that stretches along the coastal fringe of Europe, from Norway to North Portugal (down to the Coimbra area), and including Britain and Ireland.