Monument to Enrico Martínez, Stone monument next to Metropolitan Cathedral, Mexico City, Mexico.

The Monument to Enrico Martínez, also called Monumento Hipsográfico, is a bronze statue of a laurel-crowned matron in a toga, standing 8 meters tall on a marble pedestal from Tepeaca, Puebla. The pedestal is carved with the latitudes and longitudes of four lakes—Zumpango, Xochimilco, Tlalocan and San Cristóbal—and with the official lengths of the meter, yard and vara. An iron grille with bronze candelabra surrounds it.

Enrico Martínez, a cosmographer under Philip II of Castile, sought ways to control the floods that afflicted Mexico City, built over Lake Texcoco; after the five-year flood that began on 21 September 1629, he left his drainage work unfinished at his death in 1632. The system was completed under Porfirio Díaz, whose Secretary of Development Vicente Riva Palacio commissioned this monument. Designed by Francisco Jiménez with sculpture by Miguel Noreña, it was begun in July 1877 and inaugurated on 5 May 1881.

The monument gave its name to El Nivel, the city's oldest cantina, which operated from 1857 to 2008. Its pedestal also carries the official lengths of the meter, the yard and the vara, so visitors can compare three measurement systems on one stone.

The monument sits in the historic center right beside the cathedral and is easily reached on foot. The plaza around it is accessible and well connected to public transportation and other attractions in the area.

The base includes official calibration marks for both metric and imperial measurement systems carved into stone. This made the site a reference point where two different measurement standards could be compared and verified.