Santiago Tianguistenco, often simply called Santiago by locals, is a city located in Mexico State about thirty km south of the state capital of Toluca. It is the municipal seat for the municipality of Tianguistenco. It is located in the southwest part of the Valley of Toluca at the edge of the Ajusco mountain range that separates it from Mexico City. The name Tianguistenco is from Nahuatl and means “at the edge of the tianguis,” which is a traditional Aztec market.