Spain has Madrid as its capital and Spanish as its official language, with Basque, Catalan and Galician recognized regionally. It is led by King Juan Carlos I and Prime Minister Mariano Rajoy. The major rivers include the Tajo, Segura, Miño, Ebro, Guadalquivir and Guadiana. The key mountain ranges shaping Spain's relief are the Teide, Tramuntana, Picos De Europa, Montes Of León, Guadarrama, Central System, Iberian System, Betic System and Gredos.