Spain is located in southern Europe, bordering Portugal, France, and the Mediterranean Sea. The dominant religion is Roman Catholicism, though only about 70% of Spaniards identify as such and many do not regularly attend services. Spain has a parliamentary constitutional monarchy government, with King Juan Carlos I as head of state and Prime Minister Mariano Rajoy as head of government. The main political parties are the conservative People's Party and the center-left Spanish Socialist Workers' Party.