Guadiana

Guadiana River Rio Guadiana
The Guadiana River in the area around Serpa, Portugal
About 83 percent, 55,000 square kilometres (21,000 sq mi), of the River Guadiana watershed is in Spain; the rest is in Portugal (interactive map)
Etymology	Arabic derivative of Wādī + Ana, meaning "Anas (an Arabic name")
Location
Country	Spain and Portugal
Physical characteristics
Source	Ojos del Guadiana
• location	Villarrubia de los Ojos, Castile–La Mancha, Spain
• coordinates	39°7′36″N 3°43′36″W / 39.12667°N 3.72667°W / 39.12667; -3.72667
• elevation	608 m (1,995 ft)
Mouth	Gulf of Cádiz
• location	Vila Real de Santo António, Algarve, Portugal
• coordinates	37°10′12″N 7°23′37″W / 37.17000°N 7.39361°W / 37.17000; -7.39361
• elevation	0 m (0 ft)
Length	818 km (508 mi)
Basin size	67,733 km2 (26,152 sq mi)
Depth
• minimum	5 m (16 ft)
• maximum	17 m (56 ft)
Discharge
• average	78.8 m3/s (2,780 cu ft/s)
• minimum	20 m3/s (710 cu ft/s)
• maximum	1,500 m3/s (53,000 cu ft/s)
Basin features
Tributaries
• left	Upper Guadiana Azuer Jabalón Zújar Matachel Ardila Chança River
• right	Cigüela / Záncara Bullaque Estena Degebe Ribeira do Vascão

The Guadiana River (/ˌɡwɑːdiˈɑːnə/, also US: /ɡwɑːdˈjɑːnə/,^[1][2] Spanish: [ɡwaˈðjana], Portuguese: [ɡwɐðiˈɐnɐ]), is an international river defining a long stretch of the Portugal-Spain border, separating Extremadura and Andalusia (Spain) from Alentejo and Algarve (Portugal). The river's basin extends from la Mancha and 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 829 kilometres (515 mi), it is the fourth-longest in the Iberian peninsula, and its hydrological basin extends over an area of approximately 68,000 square kilometres (26,000 sq mi) (the majority of which lies within Spain).