Jigokudani Monkey Park (地獄谷野猿公苑 Jigokudani Yaen Kōen) is in Yamanouchi, Shimotakai District, Nagano Prefecture, Japan at (36°43′58″N138°27′46″E). It is part of the Joshinetsu Kogen National Park (locally known as Shigakogen), and is located in the valley of the Yokoyu-River, in the northern part of the prefecture.