river flowing from NC Spain across N Portugal into the Atlantic: c. 500 mi (805 km)
See Douro in American Heritage Dictionary 4
(dôrˈo͞o, dōˈro͝o) also Due·ro(dwĕrˈō)
A river rising in north-central Spain and flowing about 772 km (480 mi) westward then southwestward along the Spanish-Portuguese border. It enters the Atlantic Ocean at Oporto.