Shiratani Unsuikyo

Wikimedia Commons

Shiratani Unsuikyo

Island

Shiratani Unsuikyo is a mossy cedar forest and river gorge on Yakushima Island, known for dense yakusugi cedars and scenic hiking. Travelers come for short day hikes, close-up views of ancient trees and misty, fairytale-like scenery.

Shiratani Unsuikyo Map data © OpenStreetMap contributorsKagoshimaShiratani Unsuikyo

Shiratani Unsuikyo essentials

Address: Yakushima, Kagoshima Prefecture, Japan

Shiratani Unsuikyo is a wooded defile on the central-west side of Yakushima, part of the island’s celebrated yakusugi cedar forest. The landscape is characterized by steep, rocky stream channels, thick moss carpets and towering sugi (cedar) trees that give the area a primeval feel.

The site lies within the broader Yakushima UNESCO-listed natural zone and protects old-growth cedars of various ages rather than a single famous tree. Trails in the area pass through humid, shaded forest where light and mist create dramatic photographic opportunities and a sense of ancient woodland.

Visiting is mostly a walking experience rather than a museum-style visit: paths range from easy riverside strolls to longer hikes over uneven, often slippery ground. The forest is frequently wet and quiet, with only basic visitor facilities nearby, so expect a simple, nature-focused outing.

  • Moss-covered rockscape: Extensive carpets of bright green moss on boulders and fallen logs create the forest’s most striking visual feature.
  • Yakusugi cedars: Various ancient cedar trees, some several centuries old, punctuate the trails and offer close-up views of gnarled trunks and thick bark.
  • Shiratani stream and pools: Clear mountain water flows through the gorge with small cascades and reflective pools ideal for photos.
  • Short and longer trails: A network of paths lets you choose a short loop of an hour or multi-hour hikes that explore deeper forest sections.
  • Forest atmosphere and light: Diffused light, mist and the sound of water make the area feel otherworldly, especially early morning or after rain.
Things to Do
When to Go

Best Time to Visit Shiratani Unsuikyo#

Yakushima has a warm, very wet climate with heavy rainfall in late spring and summer; choose drier months for the most comfortable hiking. Weather can change quickly at any time of year, so be prepared for rain.

Winter (best)
November - February · 4°C - 16°C (39°F - 61°F)
Cooler and relatively drier months with less rain than spring and summer, making trails easier to manage and lighting in the forest clear and crisp.
Spring (shoulder season)
March - May · 7°C - 20°C (45°F - 68°F)
Warming weather brings lush growth and strong green colors, but rainfall rises from April into May so expect wet conditions on trails.
Early summer - Monsoon (least suitable)
June - August · 18°C - 26°C (64°F - 79°F)
June and July see the heaviest monthly rainfall, producing very wet, humid conditions and slipperier paths, so exercise extra caution or avoid heavy-hike plans then.

Weather & Climate near Shiratani Unsuikyo#

Climate

Shiratani Unsuikyo's climate is classified as Humid Subtropical - Humid Subtropical climate with warm summers (peaking in August) and cold winters (coldest in January). Temperatures range from 4°C to 26°C. Heavy rainfall (3226 mm/year), wettest in June.

Air Quality: AQI 50 Good
Best Time to Visit
AugustJulySeptember
Temperature & Rainfall
Temperature Range
32°
Warmest Month
6°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January Poor 4° - 10° 3° 156 mm overcast 75% 7.3 m/s 0.5 moderate 10.3h
February Poor 4° - 10° 4° 182 mm overcast 74% 6.4 m/s 0.8 moderate 11.0h
March Poor 7° - 13° 7° 236 mm overcast 73% 5.9 m/s 1.1 high 11.9h
April Acceptable 11° - 17° 14° 284 mm overcast 74% 5.7 m/s 1.4 high 12.8h
May Acceptable 14° - 20° 17° 374 mm overcast 78% 4.8 m/s 1.6 very high 13.6h
June Good 18° - 23° 20° 531 mm overcast 86% 4.3 m/s 1.5 very high 13.9h
July Very Good 21° - 26° 24° 344 mm partly cloudy 85% 4.6 m/s 2.1 extreme 13.8h
August Very Good 21° - 26° 24° 314 mm partly cloudy 81% 4.8 m/s 2.1 extreme 13.1h
September Very Good 19° - 24° 22° 289 mm partly cloudy 79% 3.9 m/s 1.6 very high 12.2h
October Good 15° - 20° 18° 198 mm partly cloudy 74% 5.6 m/s 1.1 high 11.3h
November Acceptable 11° - 16° 13° 177 mm overcast 73% 6.5 m/s 0.7 moderate 10.5h
December Poor 6° - 12° 5° 141 mm overcast 74% 7.3 m/s 0.5 low 10.1h
Getting There & Around

How to Get to Shiratani Unsuikyo#

The nearest major gateway is the city of Kagoshima on Kyushu, from which regular ferries and flights connect to Yakushima; on the island itself the main ports are Miyanoura and Anbō and the island has a small airport (Yakushima Airport).

From Miyanoura or Anbō you cover the last stretch by local bus, taxi or rental car to the Shiratani Unsuikyo trailhead; some routes start at a nearby visitor area or parking and then lead into the forest on foot - check local timetables and road conditions before you travel.

Tips for Visiting Shiratani Unsuikyo#

  • Bring waterproof clothing and good-grip footwear because trails are frequently wet and can be slippery.
  • Allow at least a half-day if you plan to explore several trails; longer hikes into the interior require more fitness and daylight.
  • Respect trail signs and stick to paths to protect fragile moss and root systems; avoid trampling vegetation.
  • Facilities are basic in the forest itself - carry water and snacks and check opening days of any visitor points locally.