Hierve el Agua
This series of natural rock formations and mineral springs has become a popular day trip from Oaxaca which can be combined with hikes in the Valle de Tlacolula. These calcified waterfalls are formed by mineral water which has pushed through karstic limestone, depositing falls and small pools onto the cliff’s edge. Prior to the 1300s when they appear to have been abandoned, the springs supplied an ancient irrigation system for the valley below through a series of canals and terraces, unique to Mexico.
