The caves were officially declared a national park by President Lázaro Cárdenas in 1936.
The cavern system is located within the Sierra Madre del Sur mountain range.
Many of the interior chambers reach heights of up to 80 meters, creating vast underground cathedrals.
The cave system continues to be naturally sculpted by the active underground passage of the Chontalcoatlán and San Jerónimo rivers.
The temperature inside the caves remains constant throughout the year, independent of external weather conditions.
Parque Nacional Grutas de Cacahuamilpa is one of the largest cave systems in the world, featuring 90 distinct chambers formed by the confluence of the Chontalcoatlán and San Jerónimo rivers. The caverns contain massive limestone formations, including stalactites and stalagmites that have been sculpted over millions of years. The subterranean tour covers approximately two kilometers of illuminated pathways inside the mountain. Above ground, the park encompasses over 1,500 hectares of protected natural terrain characterized by tropical deciduous forest. The park serves as a hub for both speleology and adventure sports, including river rappelling and zip-lining. It remains an active geological site where mineral deposition continues to alter the cave interior.
The 'Salón de los Tronos' (Hall of Thrones) offers the most expansive scale for photography.
Wear closed-toe shoes with non-slip soles due to the naturally damp and uneven cave floor.
Carry a light jacket, as the interior temperature is cooler than the external tropical climate.
Follow the official guided tour to access deeper galleries that are restricted to self-guided visitors.
Avoid visiting on major holiday weekends, as the narrow pathways become extremely congested.
Open daily year-round, though parts of the lower cave system may close during peak rainy season due to river levels.
Do not touch the stalactites or stalagmites, as oils from human skin can halt their growth process.
