Jigokudani Monkey Park, also known as Jigokudani Yaen-Koen, is a stunning nature reserve located in Nagano Prefecture, Japan. The name "Jigokudani" poetically translates to "Hell Valley," aptly describing the rugged mountain landscape with steep cliffs and clouds of steam rising from numerous hot springs. The park is situated in the picturesque Yokoyu River valley, at an altitude of about 850 meters above sea level, and is part of the larger Shigakogen National Park.

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The main highlight and world-famous attraction of Jigokudani Monkey Park are the Japanese macaques, often referred to as snow monkeys. These charming primates are famous for their unique and endearing habit of taking baths in natural hot springs (onsens) to stay warm during the cold season. The sight of relaxed monkeys soaking in warm water amidst a snowy landscape attracts photographers and tourists from around the world.
The Japanese macaques living here are the northernmost population of primates in the world (excluding humans), perfectly adapted to harsh winter conditions with heavy snowfall and low temperatures. The park is especially picturesque in winter, when snow covers everything, creating a magical contrast with the billowing steam from the onsens and the monkeys' dark fur. A visit to Jigokudani is a unique opportunity to observe wild animals in their natural habitat and see one of Japan's most unusual natural phenomena.