Tlalpan

Delegaci�n, central distrito federal (�federal district�), central Mexico. At 1,425 feet (2,294 m) above sea level in the Valley of Mexico, it is on the northeastern slopes of the extinct Cerro Ajusco volcano. In the district are remains of a pre-Columbian town, and 1.5 miles (2.5 km) west of Tlalpan is the Cuicuilco Pyramid, considered to be the oldest man-made structure on the North American continent