Bosque de Tlalpan, Nature reserve in Tlalpan district, Mexico City.

Bosque de Tlalpan is a 253-hectare protected natural area in Tlalpan, southern Mexico City, at the foot of the Sierra del Ajusco. It combines oak forest and xerophytic scrub with tree nurseries planted in the 20th century, and holds the Montículo de Tenantongo, remains of Cuicuilco's platform, aqueducts and dikes. A low dry-stone retaining wall of rough grey and brown stones runs along a grassy edge beside a paved walkway.

The forest area is a remnant of the original woodlands that once covered the region before Mexico City's urban expansion. It survived decades of growth and was later protected to preserve one of the few remaining natural areas in the city.

The forest holds a casa de la cultura, and its grounds contain the Montículo de Tenantongo, remains of a Cuicuilco platform, aqueducts and dikes. The site's name comes from the Tlalpan district, and the forest is used today for family recreation, athletics and sports clubs, with runners making up 63.5% of visitors.

The reserve has multiple entrances connected to public transportation with dedicated parking areas available. Clear signage marks walking and cycling paths, and early morning and late afternoon visits offer the best conditions for exploring the trails comfortably.

The forest holds the Montículo de Tenantongo, remains of a Cuicuilco-era platform, aqueducts and dikes, partly buried by lava from the Xitle volcano around 250–300 AD. The low dry-stone retaining wall along the path, fitted without mortar, is a detail visitors walk past without noticing.