Wikipedia
Chicomoztoc is the name for the mythical origin place of the Aztec Mexicas, Tepanecs, Acolhuas, and other Nahuatl-speaking peoples (or Nahuas) of the central Mexico region of Mesoamerica, in the Postclassic period.
There is an association of Chicomoztoc with certain legendary traditions concerning Culhuacan (Colhuacan), an actual pre-Columbian settlement in the Valley of Mexico which was considered to have been one of the earliest and most pre-eminent settlements in the valley. Culhuacan ("place of those with ancestors" is its literal meaning in Classical Nahuatl) was viewed as a prestigious and revered place by the Aztec/Mexica (who also styled themselves 'Culhua-Mexica'). In Aztec codical writing, the symbol or glyph representing the toponym of Culhuacan took the form of a 'bent' or 'curved' hill (a play on the homonym col- in Nahuatl, meaning "bent, twisted", e.g. as if by old age).
Some researchers have attempted to identify Chicomoztoc with a specific geographic location, likely between 60 and 180 miles northeast of the Valley of Mexico including perhaps a height near the present-day town of San Isidro Culhuacan. The purported existence of actual underground caves plays a role in New Age Mayanism.