Tajo

Tagus River
Tajo, Tejo
View of Tagus River in Toledo, Spain
Countries	Spain, Portugal
Tributaries
- left	Guadiela, Algodor, Gévalo, Ibor, Almonte, Salor, Sever, Sorraia
- right	Gallo, Jarama, Guadarrama, Alberche, Tiétar, Alagón, Zêzere
Source	Fuente de García
- location	Montes Universales, Sierra de Albarracín Comarca, Teruel, Aragon, Spain
- elevation	1,593 m (5,226 ft)
Mouth	Estuary of the Tagus
- location	Atlantic Ocean near Lisbon, Portugal
- elevation	0 m (0 ft)
Length	1,007 km (626 mi)
Basin	80,100 km2 (30,927 sq mi)
Discharge
- average	500 m3/s (17,657 cu ft/s)
Path of the Tagus through the Iberian Peninsula
Website: Confederación Hidrográfica del Tajo

The Tagus (Spanish: Tajo [ˈtaxo]; Portuguese: Tejo [ˈtɛʒu]; Latin: Tagus; Ancient Greek: Τάγος Tagos) is the longest river in the Iberian Peninsula. It is 1,007 km (626 mi) long, 716 km (445 mi) in Spain, 47 km (29 mi) along the border between Portugal and Spain and 275 km (171 mi) in Portugal, where it empties into the Atlantic Ocean near Lisbon. It drains an area of 80,100 square kilometers (30,927 sq mi) (the second largest in the Iberian peninsula after the Douro). The Tagus is highly utilized for most of its course. Several dams and diversions supply drinking water to most of central Spain, including Madrid, and Portugal, while dozens of hydroelectric stations create power. Between dams it follows a very constricted course, but after Almourol it enters a vast alluvial valley prone to flooding. At its mouth is a large estuary on which the port city of Lisbon is situated.

The source of the Tagus is the Fuente de García, in the Frías de Albarracín municipal term, Montes Universales, Sistema Ibérico, Sierra de Albarracín Comarca. All its major tributaries enter the Tagus from the right (north) bank. The main cities it passes through are Aranjuez, Toledo, Talavera de la Reina and Alcántara in Spain, and Abrantes, Santarém, Almada and Lisbon in Portugal.