a river in SW Europe, rising in S central Spain and flowing west, then south as part of the border between Spain and Portugal, to the Gulf of Cádiz. Length: 578 km (359 miles)
Guadiana in American English
(ˌgwɑdiˈɑnə)
river flowing from SC Spain west & then south into the Atlantic, forming part of the Spanish-Portuguese border: c. 510 mi (821 km)