At Chojabaru, you can enjoy the Kuju mountains while keeping your walk down at their feet. A wooden boardwalk runs into Tadewara wetland, where grasses, flowers and the changing mountain backdrop reward a slow pace. Start at Chojabaru Visitor Center in Oita Prefecture and choose a short circuit that suits your group. Aso-Kuju National Park also includes the Aso volcanic landscape in Kumamoto, but its crater is a separate destination with separate access controls.
Tadewara sits around 1,000 metres above sea level, with spring water from the surrounding mountains helping to feed the wetland. It is a patchwork rather than one uniform field: reed and moor-grass communities, sphagnum moss and neighbouring woodland respond to different conditions underfoot. The boardwalk lets you look into this living landscape without trampling it. Notice how plant height and texture change, and how a small flower becomes easier to see when you stop looking only at the mountains.
This open view also tells a human story. Local people have long used grasslands for grazing, fodder and other materials, and managed burning, known as noyaki, helps prevent trees taking over. Spring can briefly leave a blackened landscape before fresh growth returns. The wetland’s conservation depends on water, climate and continuing care together. Seeing the grassland as something people help maintain makes the visitor center’s films and displays especially worthwhile.
For an easy introduction, take the short scenic boardwalk. For more time among the flowers, choose the longer wetland circuit. The longest local option adds broad-leaved woodland, where oak and beech leaves filter the light and sphagnum makes a very different green foreground. You can have a satisfying outing without joining the mountain trails toward Amagaike, Bogatsuru or the summits. Stop at the signed junctions and check your chosen circuit before continuing.
Summer brings wild Japanese iris and the distinctive blue flower heads of higotai, a globe thistle. Later, great burnet adds small dark-red heads among the grasses. Birds and insects can be harder to spot than flowers, so give them time: pause, listen and watch from the path. The visitor center’s current nature display is a useful way to learn what is in season. The plants and animals below are part of the local habitat; what you see will depend on the season, weather and a little luck. Be ready to snap and learn! Get the Snappit app to identify any nature species you find here.
Aso-Kuju National Park was established on 4 December 1934. Tadewara and the separate upland wetland of Bogatsuru were jointly registered under the Ramsar Convention on 8 November 2005. Their shared designation does not make them one continuous easy walk: Tadewara is beside the visitor center, while Bogatsuru lies higher in the mountains. The region’s grasslands also preserve a history of grazing, mowing and burning, practices now sustained in part through conservation work and volunteers.