An arid region on the Atlantic coast of north-western Africa, forming the southern part of Western Sahara. It was united with Saguia el-Hamra in 1958 to form the province of Spanish Sahara (now Western Sahara).
Definition of Río de Oro in US English:
Río de Oro
proper nounˌrēō dē ˈôrō
An arid region on the Atlantic coast of northwestern Africa, forming the southern part of Western Sahara. It was united with Saguia el-Hamra in 1958 to form the province of Spanish Sahara (now Western Sahara).