Ciudad Serdán
Introduction '''Ciudad Serdán''' (formerly San Andrés Chalchicomula) is the municipal seat of Chalchicomula de Sesma Municipality in the Mexican state of Puebla.Its geographical coordinates are 18° 59′ North, and  97° 27′  West. Its average altitude is  above sea level.
References
External links * https://web.archive.org/web/20110526203349/http://www.e-local.gob.mx/work/templates/enciclo/puebla/Mpios/21045a.htm