The Guadalquivir is the third longest river in Spain (after the Tagus and Ebro), and the longest in Andalusia. The name comes from the Arabic al-wād al-kabÄ«r (الوادي Ø§Ù„كبير), 'The Great River'. The river was called Betis (or Baetis) from Pre-Roman times to the Al-Andalus period, giving its name to the Hispania Baetica Roman province.