Jigokudani Yaen Koen and its snow monkeys of Yamanouchi

Jigokudani Yaen Koen in Yamanouchi, Nagano Prefecture, is a mountain wildlife park where Japanese macaques gather around a steaming hot spring pool in a narrow forested valley. The park forms part of the Joshinetsu Kogen National Park in northern Nagano, and its hot spring bath for the monkeys has made the valley one of Japan’s most recognisable animal landscapes of the twentieth century.Joshinetsu Kogen National Park

A hot spring built for wild macaques

The central feature of Jigokudani Yaen Koen is a hot spring pool constructed specifically for the park’s troop of Japanese macaques, a species known internationally as snow monkeys.Japanese macaques The pool sits beside a natural onsen source where thermal water emerges into the rocky floor of the Yokoyu River valley, and wooden walkways and platforms give visitors elevated views of the animals at close range.Yokoyu River valley

Jigokudani means “Hell Valley”, a name derived from the rising steam, exposed rock and bursts of geothermal activity in the gorge.Hell Valley The wildlife park was established in 1964 in this setting, creating a place where the social behaviour of the macaques could be observed while keeping them in their natural mountain habitat.established in 1964 Simple timber buildings and railings frame the pool and the surrounding terraces, but the landscape remains a steep-sided valley dominated by rock faces, forest and the river below.

Monkeys, mountains and changing seasons

The macaques of Jigokudani Yaen Koen inhabit the forests of the Yokoyu River valley and the surrounding slopes of Shiga Kogen, descending to the hot spring area from the cliffs and trees around the park.forests of the valley The park sits at about 850 m (2,789 ft) above sea level, and snow lies across the valley in winter, covering the access path, the rocky ledges and the banks above the river.850 metres above sea level

In cold weather the animals gather more closely around the steaming pool, their fur catching falling snow while their faces and hands remain exposed above the water.snow-covered valley Outside the peak winter months, the same troop moves across rocks, pathways and shallow sections of the river, foraging among the trees and scrambling up and down the slopes around the viewing platforms.Japanese macaque troop The visible contrast between steep mountain terrain and a single hot spring pool adapted for primates is the defining character of a visit.

Jigokudani Yaen Koen within Yamanouchi’s onsen landscape

Jigokudani Yaen Koen lies upriver from the onsen towns of Shibu Onsen and Yudanaka Onsen, both part of Yamanouchi in Nagano Prefecture.Shibu and Yudanaka The park’s entrance area marks the transition from the settled hot spring districts of the valley into a more rugged zone of forest and river gorge, and the approach path runs as a mountain trail rather than a town street.Yamanouchi, Nagano Prefecture

The wider national park, locally known as Shigakogen, covers highlands, ski areas and wetlands above the valley, giving the monkeys an extensive habitat beyond the immediate hot spring basin.Shigakogen highlands From the viewing paths at Jigokudani, steep forested slopes rise on either side, reminding visitors that this is a mountain enclave within a larger protected landscape of Nagano’s interior.

Visiting Jigokudani Yaen Koen: what travellers from Western Europe should know

• Jigokudani Yaen Koen lies in the Yokoyu River valley in Yamanouchi, Nagano Prefecture, reached by local transport towards Shibu Onsen or Yudanaka and then on foot along a forest path.
• The approach to the park entrance follows an unpaved mountain trail through woodland, with a noticeable gradient, uneven surfaces and a series of steps near the hot spring area.
• Snow covers the valley during the colder months at around 850 m (2,789 ft) altitude, and footwear and clothing need to match a snowy forest walk rather than a town promenade.
• The official language is Japanese and the currency is the yen.

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Frequently asked questions about Jigokudani Yaen Koen

Where is Jigokudani Yaen Koen located?

Jigokudani Yaen Koen is in Yamanouchi in the northern part of Nagano Prefecture, inside the Joshinetsu Kogen National Park and the Yokoyu River valley.

What can visitors expect on a visit?

Visitors walk along a forest trail to reach a mountain basin where a troop of Japanese macaques moves around a hot spring pool, rocky terraces and riverbank paths.

What makes Jigokudani Yaen Koen distinctive?

The park is distinctive for its combination of steep mountain terrain, geothermal activity and a single hot spring pool adapted for wild snow monkeys within a protected national park landscape.