Shiratani Unsuikyo on Yakushima: Walking a Moss-Covered Ravine, the Forest of Princess Mononoke

Shiratani Unsuikyo on Yakushima is a mystical forest known for a mysterious landscape in which deep green moss covers rocks and trees. Spoken of as an inspiration for the forest in the animated film Princess Mononoke, it is one of Yakushima most popular trekking spots. A clear stream runs through the primeval forest, and you can experience up close a distinctive ecosystem lined with Yakusugi cedars and evergreen broadleaf trees. Even if a long climb like the Jomon Sugi is out of reach, its great appeal is an easy taste of the Yakushima moss forest.

Highlights

The Moss-Covered Forest

Within Shiratani Unsuikyo, the area called the moss-covered forest is especially mystical. The deep moss blanketing everything glistens freshly in the mist after rain, wrapping you in a dreamlike atmosphere as if you had wandered into a story. The rainy climate of Yakushima nurtures this rich carpet of moss. Even the rocks and fallen trees underfoot are covered in green, and when sunlight filters through, each speck of moss sparkles, a scene that symbolizes Yakushima.

Trekking Courses

From the Shiratani Plaza entrance, there are three basic courses: the beginner-friendly Yayoi Sugi course (about one hour), the Bugyo Sugi course through the moss forest (about three hours), and a full course extending to Taiko-iwa Rock (about 4 to 5 hours round trip). From Taiko-iwa a grand panorama of the Yakushima peaks opens up. Because you can choose a course to match your fitness and time, Shiratani Unsuikyo suits everyone from beginners to strong walkers. Comfortable hiking boots and rain gear are essential.

Rain and Mist

Yakushima is said to see 35 days of rain a month. On a rainy day, the moss of Shiratani Unsuikyo shines at its most beautiful, and the mist-wrapped, dreamlike mood reaches its peak. Rather than waiting for clear skies, visit ready to enjoy the faces the forest shows only in rain or mist. Because the weather changes easily, prepare rain gear whether it is fine or wet.

Seasonal Enjoyment

May and June, with beautiful fresh greenery, and autumn (October to November), with relatively settled weather, are recommended. Summer bustles with hikers but stays cool at higher elevation. Winter turns cold, with snow possible in the mountains, so bring warm clothing and proper footwear. The moss is most vibrant after rain, and a misty morning in any season makes for a dreamlike forest walk.

Access and Essentials

• About 30 minutes by car from Yakushima Airport, or 30 to 40 minutes from Miyanoura Port; infrequent route buses also run
• Courses: three kinds, the Yayoi Sugi course about one hour, the Bugyo Sugi course about three hours, and the Taiko-iwa round trip about 4 to 5 hours; choose by destination
• Entry cooperation fee: an entry cooperation fee for forest conservation is required; confirm the amount and how to pay it with on-site information
• Parking: parking is available near Shiratani Plaza and can be crowded in high season

Practical Travel Notes

• Best timing: early morning offers light and quiet; the moss is most beautiful after rain or on a misty morning
• Time and fitness: the Yayoi Sugi course takes about an hour and suits beginners, while the Taiko-iwa route is a solid 4-to-5-hour walk; choose to match your fitness
• Avoiding crowds: summer holidays and long weekends get busy, so the first bus or an early entry is more relaxed
• Nearby real spots: the moss-covered forest, Taiko-iwa Rock, the Yayoi Sugi, lodging in the Miyanoura area, and the Jomon Sugi trek (a separate course)
• Budget feel: allow for the entry cooperation fee and, as needed, a guide fee and bus fare; the easy course can be enjoyed on a low budget
• Gear: bring rain gear, hiking boots, warm clothing, drinks, and trail food; the longer the course, the more careful your preparation should be

A Word of Advice

Shiratani Unsuikyo is a forgiving spot where, with the right course, even beginners can savor the Yakushima moss forest. Precisely because this is a rainy island, carry rain gear even on a clear day. Rather than waiting for fine weather, come ready to enjoy a dreamlike walk through a mist-wrapped forest. Extending to Taiko-iwa rewards you with a superb view, but do not overdo it; choose a course that suits your fitness. Even if a serious Jomon Sugi climb is out of reach, here you can easily experience the mysterious forest that is so very Yakushima.

📚 Sources

This information is based on public materials from local governments such as Yakushima Town and tourism associations, and on public guidance for the walking and hiking paths. In this World Natural Heritage ravine, how long it takes depends on weather and path conditions. Fees, hours, and access may change, so please check official information before you set out.

Visitor Checklist

• Estimated time: About a few hours to half a day, depending on the course
• What to bring: Trekking shoes, rain gear, and food and drink; watch your footing, as the mossy paths are slippery
• Suggested route: Follow the walking paths mentioned in the article along your chosen course and enjoy the mossy forest scenery
• Access: Check access to the entrance in advance; path conditions change with the weather
• Budget: Plan a suitable budget for entry-related costs and transport