Hierve el Agua is a waterfall that stopped. Two pale cascades hang off a cliff in the Oaxacan sierra and do not move. The larger, cascada grande, drops some 30 metres down a wall that stands 80 metres above the valley floor; the smaller cascada chica sits beside it. What looks like falling water is solid rock, raised there by the springs at the clifftop and still growing. The name means "the water boils", which is the one thing that never happens here. The Zapotec farmed this water long before it was a sight to see, and what they built for it is still up on the plateau.
The plateau is where most people go. Shallow turquoise pools collect in natural stone basins along the cliff's rim and seem to spill straight into open air, like an infinity pool hung over the mountains. Wade to the edge and the valley drops away beneath your feet, ridgelines rippling to the horizon. Come at first light, before the tour vans grind up the last dirt track, and the still water turns to a mirror of the sky with a single bare branch standing in it. The site sits high in the sierra east of Oaxaca city, up narrowing switchbacks past the Zapotec ruins of Mitla and roadside mezcal palenques. Access is not guaranteed: a dispute among neighbouring communities over tourism income closed Hierve el Agua for about a year and a half, until it reopened in late 2021, and local roadblocks can still shut it without warning.