The Tagus reference article from the English Wikipedia on 24-Apr-2004
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Tagus

Image:Lisbon-from-san-jorge-castle.jpg
View over Tejo River from
São Jorge Castle in Lisbon (June 2002).

Tagus (Latin Tagus, Spanish Tajo, Portuguese Tejo) is the largest river on the Iberian Peninsula. It measures 1,008 kilometers in length, 910km of which are in Spain, the rest in Portugal.

The source of the Tagus is the Fuente de García, in the Albarracín mountains. It ends in the Atlantic Ocean by Lisbon.