Hierve el Agua Petrified Waterfalls

Hierve el Agua is a set of mineral springs and petrified waterfalls in the Sierra Madre del Sur, about 70 kilometers southeast of Oaxaca city, in southern Mexico. Water rich in calcium carbonate has seeped down the cliff face for thousands of years, leaving white stone formations that look like frozen cascades. Two main formations are visible from the main trail, a tall one rising several tens of meters and a broader terrace. A path of about 1 kilometer leads along the cliff edge for views of the formations and the valley, and natural pools at the top allow swimming in cool, mineral-rich water with a view over the drop. Photographers favor the cliff edge viewpoint and the trail down to the base, where the full height of the white formation can be seen against the green slopes. Light is best in the morning, when the pools are quiet, and again in late afternoon, while the formations appear brightest in clear midday sun. The site is reached by van or taxi from Oaxaca or on tours that often combine Mitla, Teotitlán del Valle and a mezcal distillery. Entry is a small community fee, plus parking, and local vendors sell food at the entrance. A visit lasts two to three hours. Trails are rough and slippery near the water, so sturdy shoes are advisable, and swimming is at the visitor's own risk. Weekends are crowded and tour buses arrive around midday, so arriving at opening gives the best photography.