Language isolate, the only remnant of the languages spoken in southwestern Europe before the region was Romanized. The Basque language is currently used in a narrow area of approximately 10,000 square kilometres (3,900 square miles) in Spain and France. The number of Basque-speaking persons outside that territory, in Europe and in the Americas, however, is far from insignificant. In Spain the Basque-speaking region comprises the province of Guipúzcoa, parts of Vizcaya and Navarra, and a corner of Álava, and in France the western region of the département of Pyrénées-Atlantiques. Although few statistics are available, the number of speakers, who are largely bilingual, might be judiciously estimated at 1,000,000. Most of them live in the highly industrialized Spanish part of the Basque country. The Basques have derived their name, Euskaldunak, from Euskara, the native word for their language. According to the classification of the 19th-century philologist Prince Louis-Lucien Bonaparte, there are eight modern dialects of Basque. Dialectal division is not strong enough to mask the common origin or to preclude mutual understanding. Basque attained official status for a short period (1936-37) during the Spanish Civil War, under Basque autonomous government. In 1978, Basque and Castilian Spanish became the official languages of the autonomous Basque Country, which includes Guipúzcoa, Vizcaya, and Álava provinces of Spain.