San Lorenzo Tenochtitlán (or San Lorenzo) is the collective name for three related archaeological sites—San Lorenzo, Tenochtitlán and Potrero Nuevo—located in the southeast portion of the Mexican state of Veracruz. Along with La Venta and Tres Zapotes, it was one of the three major cities of the Olmec (it was the major center of Olmec culture from 1200 BC to 900 BC). San Lorenzo Tenochtitlán is best known today for the colossal stone heads unearthed there, the greatest of which weigh or more and are high.