The Continental Celtic languages are the Celtic languages, now extinct, that were spoken on the continent of Europe, as distinguished from the Insular Celtic languages of the British Isles and Brittany. Continental Celtic is a geographic, not a linguistic, grouping of the ancient Celtic languages. The Continental Celtic languages were spoken by the people known to Roman and Greek writers as Keltoi, Celtae, Galli and Galatae. These languages were spoken in an arc stretching across from Iberia in the west to the Balkans and Anatolia in the east.