Departamento de Guaymallén
Guaymallén is a department of the central region of the province of Mendoza in the Argentine Republic, that limits to the north and the northwest with the department the Heras, to the northeast with the department Lavalle, to the west with the department Capital or City of Mendoza, to the southwest and to the south with the Godoy Cruz department and to the southeast and to the east with the Maipú department. It is the most populated in the province although its extension is 164 km², which represents 0.11% of the total area of the province.