A Yakushima Forester on the Trees That Have Seen Everything
Haruki has guided visitors through Yakushima's forests for 18 years. Born on the island and trained in forestry in Kagoshima, he came back because — as he puts it — the island called him home. He speaks quietly, walks slowly, and knows the name of every significant cedar here. Walk these trails alongside someone like him and the forest stops being scenery and starts being a living archive.
What makes Yakushima's forests different from other old-growth forests?
The combination. Yakushima is a small island — only 500 square kilometers — yet it stacks climate zones from subtropical coast to subarctic mountaintop. The mountain interior takes 10,000mm of rain a year. The granite bedrock is poor in nutrients. Together, those conditions grow trees that build themselves extremely slowly.
A cedar on the mainland might reach full size in 300 years. On Yakushima, the same species needs 1,000. The growth rings pack so tightly that the wood turns dense and resistant to decay — which is why the Jomon Sugi has stood for 2,000 years at minimum, with some estimates reaching 7,000.
The rain creates the moss. The moss holds the moisture. The moisture feeds the forest. It is a closed system that has been running for millions of years, and you feel it the moment the canopy closes over the trail.
What makes the Jomon Sugi extraordinary?
It is the oldest known living tree in Japan — trunk circumference 16.4 meters, height 25.3 meters. The age estimates span 2,170 to 7,200 years, because no one can core-sample it (it is a national monument) and the center has rotted away, which makes ring counting impossible.
Here is what most visitors miss: the Jomon Sugi is not remarkable because it is big. It is remarkable because it survived. Yakushima's cedar forests were heavily logged through the Edo period (1600–1868) for roof shingles. The loggers passed over the Jomon Sugi because it was too gnarled and twisted for timber. Its imperfection saved it.
Sit with that for a moment. The tree that was useless to the loggers became the most famous tree in Japan.
What's the trek to it actually like?
It depends on how you arrive. Most visitors come respectful. They make the long walk — 22km round trip, 8–11 hours — and by the time they reach the viewing platform they are tired, quiet, and a little undone. That is exactly the right state to be in.
Others arrive, take a selfie, and leave within two minutes, having done the hike for the photo rather than the tree. People sometimes ask whether there is a closer parking area. There is no parking area. There is an 11km walk through ancient forest, and the walk is the experience.
The best moments belong to the people who reach the platform and don't lift the phone for five minutes — who simply look. The Jomon Sugi rewards looking, so give it the looking it deserves.
What about the Princess Mononoke connection?
Hayao Miyazaki visited Yakushima in the early 1990s while developing Princess Mononoke. The Shiratani Unsuikyo Ravine — specifically its moss forest section — inspired the film's forest scenes.
That connection sparked a tourism boom: 300,000+ visitors a year now come partly for the Studio Ghibli link. The attention cuts both ways. It brings conservation funding, but the foot traffic damages the moss — some areas have been roped off after off-trail walkers crushed 200-year-old moss beds in a single season.
Moss grows at perhaps 1mm per year. A single footprint can take 200 years to recover.
So stay on the trail. The forest looks the same from the boardwalk as it does from the moss bed. The moss, though, knows the difference.
Where do most visitors never think to look?
The Yaku Saru — Yakushima's macaques. Roughly 6,000 live here, a subspecies found nowhere else. Most visitors glimpse them on the road and drive past. But sit quietly near the Yakusugi Land area in the morning — just sit, don't approach — and a troop will move through, giving you an hour of their social dynamics.
The dominant females run the troop. The males are loud but not in charge. The babies ride their mothers' backs. It is riveting sociology if you bring patience.
Then there is Nagata Inaka-hama beach on the north coast, where loggerhead and green sea turtles nest from May to August. On a nesting night you can watch a 100kg turtle haul herself up the sand, dig a nest, lay 80–100 eggs, cover them, and return to the ocean. Guided observation tours run from 8PM (JPY 2,000, reservation required). No flash photography. No approaching within 5 meters. That turtle has been making this journey for 30+ years — nesting here long before you were born. Give her the quiet she has earned.
What should visitors do to prepare?
For the Jomon Sugi trek, arrive fit: 22km is serious, and the final section is steep. Hiking boots, not sneakers. Rain gear regardless of the forecast — Yakushima makes its own weather.
Mostly, though, prepare mentally. This is not a theme-park forest. These trees are alive and older than human comprehension. The Jomon Sugi was already growing while Egypt raised its pyramids; when Rome fell, the tree was 3,000 years old. Stand in front of it and you stand in front of deep time.
That is not something you photograph. It is something you absorb. Bring the camera — then leave it in your pocket for ten minutes.
What does Yakushima's future depend on?
Climate, first. The moss forests rely on a very specific pattern of rainfall and temperature. Warm the island by 2 degrees — which current projections suggest by 2060 — and the moss retreats uphill, the cedar growth pattern shifts, and a forest that has existed for millions of years begins to look different.
Visitor numbers, second. Pre-COVID, the Jomon Sugi trail drew 300+ hikers on busy days. The trail is narrow. The viewing platform holds maybe 20 people. Crowding degrades the very thing people come for, which is why reservation limits matter — Shiratani Unsuikyo now charges a JPY 500 conservation fee, a sensible start.
Yakushima earned its UNESCO World Heritage status for a reason. But that status draws visitors, and visitors bring impact, and balancing the two is genuinely hard. So carry the one instruction every guide here repeats: this forest has been alive for a million years, and you are here for a few hours. Walk lightly.
