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Merced District lies in the north of the canton, limiting only with Tibás Canton from San José Province to the north, and with the districts of Uruca to the north, Mata Redonda to the west, Hospital to the south, and Uruca and El Carmen "distritos" to the east, all of them from the same canton of San José.
The canton's whole boundary with Heredia Province is confined in this district: Belén, Heredia and Santo Domingo cantons limit with La Uruca on its northern side, as well as San José's Escazú and Tibás.