What is "chimimoryo"

Chimimōryō is a term, originated from China dating roughly 2,500 years in ancient chronicles such as the Zuo Zhuan, referring to monsters of the mountains and monsters of the rivers. It refers to various kinds of obake and things changed into yōkai. "Chimi" refers to the monsters of the mountains, and "mōryō" refers to the monsters of the river, and so the word "chimimōryō" is often used to refer to all monsters of the mountains and rivers. Furthermore, the word "minori" was also used for this. For this to be used to mean a "ripening" (minoru) oni has been used in various regions since ancient times.