In Aztec mythology, Tlalocan is the underworld, ruled by Tlaloc and his wife Chalchiuhtlicue. The Aztec civilization recognized many gods and supernatural creatures. ... // In the study of mythology and religion, the underworld is a generic term approximately equivalent to the lay term afterlife, referring to any place to which newly dead souls go. ... Tlaloc, also known as Nuhualpilli, was, in Aztec belief, the god of rain and fertility. ... In Aztec mythology, Chalchiuhtlicue (also Chalciuhtlicue, or Chalcihuitlicue) (She of the Jade Skirt) was the goddess of lakes and streams. ...
Tlalocan is the fourth level of the "upper worlds", or 'heavens', according to the mythic cosmographies of the Nahuatl-speaking peoples of pre-Columbian central Mexico, noted particularly in Conquest-era accounts of Aztec mythology.
Tlalocan is described in several Aztec codices as a paradise, ruled over by Tlaloc and his consort Chalchiuhtlicue.
and Tlalocan was reserved for those who had drowned or had otherwise been killed by manifestations of water, such as by flood, by diseases associated with water, or in storms by strikes of lightning.
This center of the world place is not a hell-realm but rather a bardo or in-between place that lies between the earth itself and the paradise dimensions and in particular to the Blue Paradise World of Tlalocan.