Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ndaxagua (also Ndaxagua cave, Ndaxagua natural tunnel), locally known in Spanish as El Puente Colosal (Colossal Bridge") is a natural cave with double entrance and archaeological site, located in the extreme northern end of the Coixtlahuaca Basin, central-southern Mexico. The cave is on the periphery of the Maya region, but was most likely used by other pre-Columbian Mesoamerican cultures such as the Zapotec and Mixtec as well. The cave gets its name from a natural rock bridge formation above it. The cave functioned as a sacred entrance into the basin. Several Coixtlahuaca codices refer to this cave. In codex depictions, the cave was believed to be the place where Quetzalcoatl descended from heaven. "