El Mantaro District is one of thirty-four districts of the Jauja Province, located in the Department of Junín in Peru. Instituto Nacional de Estadística e Informática. Banco de Información Distrital . Retrieved April 11, 2008. The district was created by the Law No. 4404 in November 23, 1921, during the presidency of Augusto B. Leguía. It encompasses an area of 17.76 km2.
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