Tagus (Latin Tagus, Spanish Tajo, Portuguese Tejo, pron. ) is the largest river on the Iberian Peninsula. It measures 1,038 kilometers in length, 716 km of which are in Spain, 47 km as border between Portugal and Spain and the remaining 275 km in Portugal. It drains an area of 80,100 Km² (the second largest in the Iberian peninsula after the Douro).