Arrien is a town and commune in the Pyrénées-Atlantiques département, in southwestern France. The commune is the lowest level of administrative division in the French Republic. Pyrénées-Atlantiques ( Gascon: Pirenèus-Atlantics; Basque: Pirinio-Atlantiarrak or Pirinio-Atlantikoak) is a department In the context of the political and geographic organization of France and many of its former colonies a department (département depaʁtǝmɑ̃ is an Administrative division This article is about the country For a topic outline on this subject see List of basic France topics.