Jigokudani is a valley surrounded by steep rock walls where steam can be seen rising from natural hot spring activity. Surprisingly, the spa is for exclusive use by wild monkeys - a world rarity indeed. The sight of them enjoying a comfortable soak in their own hot water is humorous to say the least. These 200 or so wild monkeys now are domestically fed. Visitors can observe their natural lifestyle and numerous photos are on display at the park management building. Approximately 25 minutes' walk from Kambayashi hot-spring resort.