Oze National Park

Listen to the boardwalk first. Each wooden plank gives a hollow knock under your boots, and the sound carries a long way across the open marsh. Around you, the air smells of wet grass, peat and cold water. The light here moves across the moor in slow sheets as clouds pass over the mountains. This is Oze, one of the great highland wetlands of Japan, and the boards beneath your feet are part of the reason it has survived.

Oze became its own national park in 2007. Before that, it was part of Nikko National Park, which lies to the south. The new park was drawn to include the marshlands and the surrounding peaks as a single protected landscape. It crosses the borders of four prefectures, Fukushima, Gunma, Niigata and Tochigi. Many visitors arrive from the Gunma side, but the Fukushima side, through the mountain village of Hinoemata, leads into some of the quietest corners of the park.

The heart of the park is Ozegahara, a wide high moor. It sits at roughly 1,400 metres above sea level and is often described as the largest high moor on the main island of Honshu. A high moor forms when dead plants build up faster than they can rot. Cold temperatures and waterlogged ground slow the decay almost to a stop. Over thousands of years, those layers became peat. The ground you see is a living sponge that grew upward very slowly, and a single careless footstep can damage it for decades.

That is why the boardwalks exist. They run for many kilometres across the wetlands, usually as two narrow parallel tracks. Hikers keep to the left, so walkers can pass each other without stepping onto the moss. Look closely at the planks. Some are pale and new, while others are grey and soft with age. The boards are replaced in stages, and many of the older ones carry small branded marks that show the year they were laid. It is a quiet record of constant repair.

Here is something many visitors do not expect. A large share of the land in Oze is owned by the Tokyo Electric Power Company. In the early twentieth century, engineers saw this basin as an ideal site for a hydroelectric reservoir. Plans to flood the marsh came up again and again. They were never carried out. Today the same company that once wanted the water helps to maintain the boardwalks and the conservation work. The landscape you see is partly the result of a long argument between power and preservation.

One family stands at the centre of that argument. In the late nineteenth century, a man named Chozo Hirano built a simple mountain hut beside Ozenuma Pond. His family stayed on for generations, guarding the area and speaking out against the dam plans. Their lodge, known as Chozo-goya, still stands near the pond. Many Japanese visitors see it as a symbol of the early conservation movement. It is a reminder that protecting a place often begins with a few stubborn people who refuse to leave.

Ozenuma itself is a large mountain pond on the eastern side of the park, close to the Fukushima border. On calm mornings, the surface holds a near-perfect reflection of the surrounding slopes. Mist often lifts from the water just after sunrise. The shoreline is a mix of marsh grass, small wooded islands of conifers and patches of open bog. Walking around the pond takes a few hours at an easy pace, and the views change at almost every bend.

Above the pond rises Mount Hiuchigatake, the highest peak in the Tohoku region of northern Japan. It is a volcanic mountain, and its rough, layered shape is easy to pick out from the marsh. On the other side of the basin stands Mount Shibutsu, known for its serpentine rock. This greenish stone weathers into a slippery, crumbly surface, and it supports rare alpine plants that cannot grow in ordinary soil. Between these two peaks lies the whole quiet bowl of Oze.

For many Japanese people, Oze means one plant above all. It is mizubasho, a white skunk cabbage. In late spring, when the snow melts, thousands of pure white sheaths appear along the streams and wet hollows. A popular post-war song called Summer Memories mentions these flowers in Oze, and it helped make the park famous across the country. Many older visitors still hum the tune as they walk. The song made a remote mountain marsh part of national memory.

The seasons here change the moor completely. In midsummer, yellow day lilies called Nikko kisuge cover parts of Ozegahara in warm colour. Cotton grass sends up small white tufts that move in the wind. By early autumn, the grasses turn gold and rust, a change locals call kusa-momiji, which means autumn colours of the grass. Then the snow comes, and the lodges close. For much of the year, deep snow covers the whole basin and the boardwalks disappear.

Oze has given Japan more than flowers. The idea of carrying your own rubbish home became widespread here. In the 1970s, the park removed many waste bins and asked hikers to take everything back with them. The practice spread to mountains and parks across the country. Some trailheads also have mats or brushes for cleaning boots. These help to stop seeds from outside plants from reaching the fragile marsh. Small habits like these protect the place you are standing in now.

Private cars cannot drive into the heart of the park. Visitors leave their vehicles at the edge and continue by shuttle bus or on foot through mountain passes. On the Fukushima side, the route from Numayama Pass leads down to Ozenuma. Inside the park, there are mountain lodges where hikers can stay overnight. Staying the night lets you see the marsh at dawn and dusk, when the light is low and the day visitors are gone. Asian black bears live in these forests, so many hikers carry small bells.

As you walk, notice how sounds behave in this open space. A voice carries far across the moor, and a footstep on the boards seems louder than it should. Frogs call from small dark pools called chitou, which are scattered across the marsh like pieces of a broken mirror. Dragonflies cross the path in summer. Birds call from the tree line. Without traffic or buildings, every small sound becomes part of the landscape.

Before you go on, stand still for a moment on the boardwalk. Look down at the wet moss on either side, the slow work of thousands of years. Look up at the mountains that hold this basin like cupped hands. The marsh is still growing, very slowly, under the sky. When you start walking again, listen to the knock of the planks beneath you. That sound means the moor is safe for another day.