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In page Regions of Chile:

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Each region is given a Roman numeral, followed by a name (e.g. IV Región de Coquimbo, read as "fourth region of Coquimbo" in Spanish). When the regional structure was created, Roman numerals were assigned in ascending order from north to south, with the northernmost region designated as I (first) and the southernmost region as XII (twelfth). The Santiago Metropolitan Region, located in the center of the country and home to the country's capital Santiago, was excluded from this naming scheme and given instead the initials RM, standing for Región Metropolitana ("Metropolitan Region" in Spanish). With the creation of regions XIV and XVI in the south and XV in the north (XIII is not used) in 2007, the north-south Roman numeral order was broken.