a region in NW Africa on the Atlantic coast, bounded by Morocco, Algeria, and Mauritania: a former Spanish province comprising Río de Oro and Saguia el Hamra 1884–1976; divided between Morocco and Mauritania 1976; claimed entirely by Morocco 1979, but still under dispute. 165,000; ab. 102,700 sq. mi. (266,000 sq. km). Formerly, Spanish Sahara.