Area (more precisely delegación)in the south part of Mexico City. It is close to the Periferico, and borders with Xochimilco and the UNAM campus.
The easiest way to get there is to board a San Fernando pesero in San Angel and get off before the La Salle university.

This used to be a separate village (originally not part of Mexico City), and the main square still has a lot of old time flavor.
Cool places to visit are the large Bosque de Tlalpan, Plaza Cuicuilco and Peña Pobre.

It is much less touristy than Coyoacan, and the old area (south of San Fernando) is very nice for strolling.

It also contains some unpleasant and unsafe parts, like Isidro Fabela.