Ik Kil

Ik Kil doesn't look like a cave that happened to fill with water — it looks like the ground simply gave way, which is essentially what happened. The cenote sits open to the sky, a nearly circular shaft about 60 metres across where the water sits some 26 metres below the surrounding ground level and continues down to a depth of roughly 48 metres. Vines hang from the rim all the way to the water; it's a hole in solid limestone that happens to be full.

To the Maya, that kind of opening wasn't just useful — it was theologically significant. Cenotes were understood as literal entrances to Xibalba, the underworld, and Ik Kil, a short distance from Chichén Itzá, was used accordingly: as a site for offerings and human sacrifice to Chaac, the rain god, in a region where surface water was scarce enough that rain itself was worth sacrificing for. Archaeologists and speleologists working the site have recovered human bone and jewellery from the water, physical confirmation of what the historical record already suggested.

What you swim in today is the same water. Ik Kil has been opened to visitors as a swimming site, which means the casual afternoon dip on offer now happens in the same shaft that Maya priests once regarded as a doorway to the land of the dead — a detail that tends not to make it onto the pool-noodle rental sign.

Getting there

Located in Chichén-Itzá. Felipe Carrillo Puerto International Airport Tulum (TQO) is about 107 km away.