Sumidero de Popoca, Underground lake and pit cave in Zongolica Municipality, Mexico.
The Sumidero de Popoca is an underground cave with a waterfall system located in the mountain region of Zongolica. Water flows powerfully through the entrance area and drops into a subterranean lake below.
This cave system formed over long periods as water carved through rock layers. The geology of the eastern Sierra Madre del Sur shaped the structure of this underground network.
Local communities in the area share stories about this place that have been passed down through generations. These narratives shape how people today understand and relate to the site.
Access to this site depends heavily on the season, as water levels shift and underground conditions vary significantly. It helps to check conditions in advance and bring appropriate clothing plus sturdy footwear.
The cave system extends far deeper into the mountains than most visitors expect and functions as a natural reservoir for the region's groundwater. This hidden role shows how important this underground place is to the local ecosystem.
Location: Zongolica Municipality
GPS coordinates: 18.76175,-96.96206
Latest update: December 12, 2025 14:40
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