Tlālōcān is described in several Aztec codices as a paradise, ruled over by the rain deity Tlāloc and his consort Chalchiuhtlicue. It absorbed those who died through drowning or lightning, or as a consequence of diseases associated with the rain deity. Tlālōcān has also been recognized in certain wall paintings of the much earlier Teotihuacan culture. Among modern Nahua-speaking peoples of the Gulf Coast, Tlālōcān survives as an all-encompassing concept embracing the subterranean world and its denizens.

Tláloc is the god of rain in Aztec religion. He was also a deity of earthly fertility and water, worshipped as a giver of life and sustenance. This came to be due to many rituals, and sacrifices that were held in his name. He was feared, but not maliciously, for his power over hail, thunder, lightning, and even rain. He is also associated with caves, springs, and mountains, most specifically the sacred mountain where he was believed to reside. Cerro Tláloc is very important in understanding how rituals surrounding this deity played out. His followers were one of the oldest and most universal in ancient Mexico.