Shikkotsu Forest

is a legendary place that is equally famous as Mount Myōboku and Ryūchi Cave. It is the home of the slug Katsuyu, parts of which are summoned by Tsunade and one of her disciples, Sakura Haruno. After being freed along side tho other beasts Kokuō stated he was going to return to Shikkotsu Forest, indicating he lived there at some point.

Inhabitants

 * Katsuyu
 * Kokuō