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Guadiana
The Guadiana River ((:ɡwaˈðjana), ), or Odiana, is an international river defining a long stretch of the Portugal-Spain border, separating Extremadura and Andalucia (Spain) from Alentejo and Algarve (Portugal). The river's basin extends from the eastern portion of Extremadura to the southern provinces of the Algarve; the river and its tributaries flow from east to west, then south through Portugal to the border towns of Vila Real de Santo António (Portugal) and Ayamonte (Spain), where it flows into the Gulf of Cádiz. With a course that covers a distance of , it is the fourth-longest in the Iberian peninsula, and its hydrological basin extends over an area of approximately (the majority of which lies within Spain).
==Etymology==
The Romans referred to the river as the ''Flumen Anas'', the ''river of ducks''. During the Moorish occupation and settlement, the name was extended and referred to as ''Uádi Ana'' (''uadi'' being the Arab term for ''river''), later passed on to Portuguese and Spanish settlers as the Ouadiana, and later just Odiana. Since the 16th century, due to Castilian influences, the name has slowly evolved to taken on the form Guadiana, a cognitive variation that developed from many Moorish-Arab river place-names using the prefix ''guad'' (such as the rivers Guadalquivir, Guadalete, Guadalajara or Guadarrama).
There is controversy about the exact source of the river in Castilla-La Mancha (see Lagunas de Ruidera).
The river flows east to west through Spain, then it flows south through Portugal, then forming the Spanish-Portuguese border, it flows into the Gulf of Cádiz, part of the Atlantic Ocean, between Vila Real de Santo António (Portugal) and Ayamonte (Spain).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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