Prismas Basálticos de Santa María Regla

The Prismas Basálticos de Santa María Regla are a set of hexagonal basalt columns formed by volcanic activity, cut through by the Río San Antonio Regla, which drops over the columns in a waterfall known as the Cascada de los Prismas Basálticos. The tightly packed, geometric rock columns form a natural amphitheater around the falls, and a network of paths and lookout platforms lets visitors walk along the canyon rim and descend closer to the water. A visit typically takes 1.5 to 2.5 hours, covering the main overlook near the entrance, the descent to the base of the falls, and a walk along the reservoir above the canyon, which was originally built to feed the nearby haciendas' hydraulic works. The clearest views of the columns' hexagonal geometry are from the lower platforms near the waterfall base and from the bridge crossing partway along the canyon rim. Weekday mornings, especially outside the rainy season, offer the calmest crowds and clearest water; weekends draw significant numbers of day-trippers from Pachuca and Mexico City, particularly around midday. The site is part of a larger network of trails connecting to the nearby Ex-Hacienda de Santa María Regla.