Jigokudani Yaen Koen and its snow monkeys of Yamanouchi
Published on 09/11/2026 at 11:46 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Jigokudani Yaen Koen in Yamanouchi, Nagano Prefecture, is a mountain valley where wild Japanese macaques soak in a hot spring pool, turning a classic onsen landscape into a close-up encounter with “snow monkeys”. Opened in 1964 in the northern part of Nagano, the park sits in the Jigokudani valley of the Yokoyu River within Joshinetsu Kogen National Park, at an elevation of around 850 m (2,789 ft), so winter snow and rising steam shape its character for months each year.Opened in 1964
Snow monkeys in a mountain hot spring valley
The core of Jigokudani Yaen Koen is a steep-sided valley where natural hot springs bubble up beside the Yokoyu River, with forested slopes rising sharply on both sides.The valley of Yokoyu River Wooden walkways and simple retaining walls frame a single hot spring pool built into the river bank, and this is where Japanese macaques gather, easing themselves into the water as mineral-rich steam drifts across the rocks.
The animals here are wild Japanese macaques, Macaca fuscata, a native primate that has adapted to cold upland climates across Nagano and neighbouring regions.Macaca fuscata population They descend from the surrounding cliffs and forest to sit in the hot spring water and then return to the security of the woods, using the park’s terraces and paths as part of their daily range rather than as a cage or enclosure. The sight of macaques grooming one another on stone ledges, then climbing down to submerge themselves up to the shoulders in the pool, is the defining scene of Jigokudani Yaen Koen.
A research-driven park in Joshinetsu Kogen National Park
Jigokudani Yaen Koen was established in the 1960s as a place where the social structure and behaviour of Japanese macaques could be observed at close range, and its official name is used alongside the English description “Jigokudani Monkey Park” in many materials.Established in 1964 The park forms part of Joshinetsu Kogen National Park, a protected upland region whose plateaux and ridges extend across northern Nagano, so the monkeys move between the valley and the wider mountain environment rather than living only beside the pool.
The altitude of around 850 m and the north-facing valley topography mean that snow can lie deep in Jigokudani during the colder months, covering boulders and branches around the hot spring while the water itself continues to flow.850 metres above sea level Visitors walk along a riverside track and timber walkways that stay above the river, and from these they can see both the steam rising from the onsen and the forest edge where macaques climb and rest. The park’s role as a wildlife observation site is reflected in its simple built structures: low railings, understated buildings and clear sightlines to the hot spring pool.
Jigokudani Yaen Koen within the onsen landscape of Yamanouchi
Jigokudani Yaen Koen lies upriver from the onsen towns of Shibu Onsen and Yudanaka Onsen in Yamanouchi, so it sits within a landscape already shaped by hot spring culture.Near Shibu and Yudanaka Traditional ryokan and public baths in these towns draw their water from the same thermal system that feeds Jigokudani, but the park focuses that geothermal activity on the behaviour of macaques rather than human bathing. The walk to the park follows the valley above the river, passing pipes, small structures and occasional plumes of steam that hint at the wider hot spring network.
Within the park, human paths and viewing platforms occupy one side of the valley, while the macaques move freely across rock faces, trees and the pool, unconstrained by fences or cages.Wild macaques at the pool Over the decades, images of Jigokudani’s snow-covered pool and steam-shrouded monkeys have circulated widely, including a cover photograph in LIFE magazine in 1970, and this has fixed the association between Yamanouchi’s mountains and the sight of bathing macaques in the minds of many travellers.Photographed for LIFE magazine
Visiting Jigokudani Yaen Koen: what travellers from Western Europe should know
- Jigokudani Yaen Koen lies in Yamanouchi in northern Nagano Prefecture; many visitors travel by rail to Nagano Station or Yudanaka Station and continue by bus along the Yokoyu River valley.
- The approach to the park includes a forest path and riverside track that can be snow-covered and icy in winter, with a noticeable gradient and several sections of compacted earth and rock underfoot.
- Within the park, viewing platforms and walkways are narrow in places and sit close to the hot spring pool, with low railings separating human areas from the rocks and water used by the macaques.
- Jigokudani Yaen Koen is in Japan, where the official language is Japanese and the currency is the yen (JPY).
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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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, within the Yokoyu River valley and Joshinetsu Kogen National Park.
What can visitors expect on a visit?
Visitors walk along a forested valley path to viewing platforms beside a hot spring pool, where wild Japanese macaques bathe, climb and interact on the surrounding rocks.
What makes Jigokudani Yaen Koen distinctive?
The park combines an upland onsen landscape, deep winter snow and freely moving Japanese macaques that use a hot spring pool, creating a rare alignment of geothermal scenery and visible animal behaviour.
