Janokuchi Falls

Janokuchi Falls, on the western side of Mount Mocchomu in the southern part of Yakushima, a World Natural Heritage site, is a hidden wilderness waterfall that spreads out deep beyond a subtropical primeval forest. It appears at the end of a trekking course of about 3.5 kilometers one way from a trailhead beside Onoaida hot spring, where water slides smoothly down a broad rock face about 30 meters tall and about 100 meters wide. The plunge pool is a clear emerald green, and the falls rank among the famous waterfalls of Yakushima alongside Okawa Falls and Senpiro Falls. Even on Yakushima, which sees many tourists, few people come here, making it a little known power spot where you can feel the power of nature in the silence.

Highlights

• The graceful and unusual sight of water sliding down a broad, flat face of granite, spanning about 100 meters in width.
• The clear emerald green plunge pool, which conveys the abundant power of Yakushima water.
• The subtropical primeval forest unique to Yakushima. The walk through woods covered in ferns and moss is itself a highlight.
• A special stretch of time facing the falls in the quiet, with few other visitors around.

Enjoying the Seasons

On rainy Yakushima the flow increases after rain, giving the falls a richer expression. In the fresh green season the forest greenery deepens, and in summer the coolness of the clear stream feels pleasant. Yakushima weather changes quickly, so visiting when there is a break in the clouds lets you fully enjoy the beauty of the forest and the falls.

Access and Basic Information

• Location: Yakushima-cho, Kumage District, Kagoshima (Onoaida area)
• Trailhead: the Onoaida path entrance beside Onoaida hot spring
• About 3.5 kilometers one way to the falls. Roughly 3 to 3.5 hours up and about 2 hours down, a day trip of about half a day round trip
• The difficulty is relatively low, but as a mountain trail it requires hiking gear
• Public transport access is difficult, so a rental car is recommended

Practical Travel Notes

• This is a serious trek that takes nearly half a day round trip. Set out in the morning and plan to descend with time to spare before sunset.
• Basic gear is hiking boots, rain gear, plenty to drink and trail food. Yakushima sees a lot of rain, so bring rain gear even on days with a fine forecast.
• When the weather turns, the streams can swell, so it is important to be willing to turn back rather than push on.
• After descending, it is customary to rest at Onoaida hot spring beside the trailhead, where bathing costs a few hundred yen. You can wash off the sweat before heading home.
• The best season is spring to early summer, when the fresh greenery shines. Prepare for the heat in midsummer and dress warmly in winter.

A Quick Tip

This is a serious trek that takes nearly half a day round trip, so be sure to bring hiking boots, plenty to drink and rain gear. When the weather turns, the streams can swell, so it is important to be willing to turn back rather than push on. After descending, a rest at Onoaida hot spring beside the trailhead is recommended.

📚 Sources

This information is based on public materials from local governments and tourism associations, and on on-site guidance for the trails and walking paths. As a mountain waterfall, whether you can visit depends on the weather and trail conditions. Fees, hours, and access may change, so please check official information before you set out.

Visitor Checklist

• Estimated time: About a few hours round trip on the trail to the falls
• What to bring: Trekking shoes, drinks, and rain gear for the mountain path; be ready for sudden weather changes
• Suggested route: Follow the trail mentioned in the article toward the falls; plan within your ability
• Access: Mainly by car to the trailhead; check road conditions in advance
• Budget: Viewing is free; only transport costs apply