Jigokudani Monkey Park is located in the valley of the Yokoyu River that flows from Shiga Kogen ski area of the northern part of Nagano Prefecture. Japanese monkeys, Macaque Fuscata, are the species that live in the northern part of the world. They live in forests, mainly in Honshu. Jigokudani is famous for its large population of wild Japanese Macaques more commonly referred to as Snow Monkeys, that stay in the valley during the winter, and like to bathe in the local hot springs. .