Andorra, officially the Principality of Andorra, is a sovereign landlocked microstate on the Iberian Peninsula, in the eastern Pyrenees, bordered by France to the north and Spain to the south. Believed to have been created by Charlemagne, Andorra was ruled by the count of Urgell until 988, when it was transferred to the Roman Catholic Diocese of Urgell. The present principality was formed by a charter in 1278. It is headed by two co-princes: the bishop of Urgell in Catalonia, Spain and the president of France. Its capital and largest city is Andorra la Vella. Andorra is the sixth-smallest state in Europe, with an area of and a population of approximately . The Andorran people are a Romance ethnic group of originally Catalan descent. Andorra is the world's 16th-smallest country by land and 11th-smallest by population. Its capital, Andorra la Vella, is the highest capital city in Europe, at an elevation of above sea level. The official language is Catalan, but Spanish, Portuguese, and French are also commonly spoken. Tourism in Andorra brings an estimated 10.2 million visitors to the country annually. Andorra is not a member state of the European Union. It has been a member of the United Nations since 1993. Etymology The origin of the word Andorra is unknown, although several hypotheses have been proposed. The oldest is one put forward by the Greek historian Polybius (The Histories III, 35, 1), who describes the Andosins, an Iberian Pre-Roman tribe, as historically located in the valleys of Andorra and facing the Carthaginian army in its passage through the Pyrenees during the Punic Wars. The word Andosini or Andosins () may derive from the Basque , meaning "big" or "giant". The Andorran toponymy shows evidence of Basque language in the area. Another theory suggests that the word Andorra may derive from the old word Anorra that contains the Basque word ("water"). Another theory suggests that Andorra may derive from Arabic (), indicating a vast land which is located among mountains or a thickly wooded place (with being the definite article). When the Arabs and Moors conquered the Iberian Peninsula, the valleys of the High Pyrenees were covered by large tracts of forest. These regions were not administered by Muslims, because of the geographic difficulty of direct rule. Other theories suggest that the term derives from the Navarro-Aragonese "andurrial", which means "land covered with bushes" or "scrubland". The folk etymology