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Chile is divided into thirteen regions, each of which is headed by an intendant (intendente). Every region is further divided into provinces headed by a governor (gobernador). Finally, each province is divided into various municipalities (comunas), each with its own mayor (alcalde). Intendants and governors are appointed by the president, mayors are elected by popular vote.
Each region is designated by a name and a Roman numeral. Numbers are assigned from north to south. In general the Roman numeral is used, rather than the name. The only exception is the region where Santiago is situated, which is designated RM, that stands for Región Metropolitana, (Spanish for Metropolitan Region).