Galician ( or ; ) is an Indo-European language of the Western Ibero-Romance branch. It is spoken by some 2.4 million people, mainly in Galicia, an autonomous community located in northwestern Spain, where it is official along with Spanish. The language is also spoken in some border zones of the neighbouring Spanish regions of Asturias and Castile and León, as well as by Galician migrant communities in the rest of Spain, in Latin America, the United States, Switzerland and elsewhere in Europe. Modern Galician is part of the West Iberian languages group, a family of Romance languages that includes the Portuguese language, which developed locally from Vulgar Latin and evolved into what modern scholars have called Medieval Galician or Galician-Portuguese. Dialectal divergences are observable between the northern and southern forms of Galician-Portuguese in 13th-century texts but the two dialects were similar enough to maintain a high level of cultural unity until the middle of the 14th century, producing the medieval Galician-Portuguese lyric. The divergence has continued to this day, producing the modern languages of Galician and Portuguese. The lexicon of Galician is predominantly of Latin extraction, although it also contains a moderate number of words of Germanic and Celtic origin, among other substrates and adstrates, having also received, mainly via Spanish and Portuguese, a number of nouns from the Arabic of Al Andalus. The language is officially regulated in Galicia by the Royal Galician Academy. However, independent organisations such as the Galician Association of Language and the Galician Academy of the Portuguese Language include Galician as part of the Portuguese language, as the Galician Portuguese variant.