Tlanchana — the Aztec mermaid of the Lerma Marshes

The Lerma Marshes near San Miguel Almaya in the State of Mexico are said to be the domain of Tlanchana, a mermaid figure from pre-Columbian mythology. Tlanchana, whose name comes from Nahuatl, is described as a beautiful woman from the waist up with a serpent's or fish's lower body. She is said to live in the lakes and swamps of the Lerma River basin, emerging to sing songs that mesmerize fishermen and lure them into the water. Those who enter her domain are never seen again. Fishermen working the marshes have reported seeing a woman's upper body rising from the water, hearing a haunting song that seems to come from all directions at once, and experiencing their boats being pulled toward deeper water by an unseen force. Tlanchana is rooted in the Aztec mythological tradition of water deities, particularly Chalchiuhtlicue, the goddess of rivers and lakes. The survival of this pre-Columbian figure in contemporary folk belief demonstrates the resilience of indigenous mythology in Mexico. The Lerma Marshes, one of the last wetland ecosystems in the Valley of Mexico, are ecologically fragile and culturally significant — and Tlanchana serves as their supernatural guardian.