Jigokudani Monkey Park

Jigokudani Monkey Park, located at the foot of the Shiga Highlands, takes its name — meaning “Hell's Valley” — from its steep slopes and the steam rising from the hot springs that spread across the open air.
Snow-covered for about a third of the year, it is best known for the 270 Japanese macaques that live there and, much like us, enjoy a soak in a “rotenburo” (open-air bath), especially in the depths of winter. These macaques, who live in large social groups, like to relax in the water or help each other groom.
Not particularly timid, they allow people to approach, seemingly undisturbed by visitors who come to observe them — perhaps due to the closeness between the two species. As a side note, aside from humans, the Japanese macaque is the primate with the northernmost habitat.