Jigokudani is situated in a mountainous area in, approximately, the center of Japan. Jigokudani Monkey Park is located in the valley of Yokoyu-River that flows from the Shigakogen area of the northern part of the Nagano-Prefecture. People called Jigokudani the Hell's Valley, because the spring water boiling and bubbling from the surface of the earth looks like it is coming from Hell..

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