What Is Oze National Park?
Oze National Park spans four prefectures: Gunma, Fukushima, Niigata, and Tochigi, covering a total area of approximately 37,222 hectares.
Its landscape is defined by Ozegahara, the largest high-altitude wetland in Honshu; Lake Ozenuma, formed by the volcanic activity of Mount Hiuchigatake; and iconic peaks such as Mount Shibutsu (Shibutsu-san, 2,228 m) and Mount Hiuchigatake (Hiuchigatake, 2,356 m).
Oze is also widely known as a place where precious natural environments have been carefully preserved.
Often called the birthplace of Japan's nature conservation movement, Oze is valued not only for its scenery but also for the philosophy of walking through nature without harming it.
In August 2007, Oze was separated from Nikko National Park and designated as an independent national park, incorporating surrounding areas such as Mount Aizu-Komagatake, Mount Tashiro, and Mount Taishaku.
Top Scenic Views to See at Oze National Park
Walking the Boardwalks Across Ozegahara Wetland
The first landscape that comes to mind when picturing Oze is Ozegahara.
Located at an elevation of about 1,400 m and stretching roughly 6 km east to west and 2 km north to south, it is the largest high-altitude wetland in Honshu, with peat layers exceeding 4.5 m thick in some areas.
Because wetland ecosystems are extremely fragile, the standard way to explore Ozegahara is to walk slowly along the wooden boardwalks, taking in the open sky, the small wetland pools, and the distant mountain ridges.
Lakeside Scenery at Lake Ozenuma and Oe Wetland
Lake Ozenuma is a mountain lake formed by the volcanic activity of Mount Hiuchigatake, sitting at an elevation of approximately 1,665 m.
One theory suggests that lava flowing from the south dammed the area near the Numajirigawa River, while another attributes its formation to a large-scale collapse on the southern slope of Mount Hiuchigatake.
Oe Wetland (Oe-shitsugen) spreads along the northern and eastern shores, and the view of lake and mountain overlapping offers a calm charm that feels quite different from Ozegahara.
Mount Shibutsu and Mount Hiuchigatake: The Peaks That Frame Oze
The appeal of Oze goes beyond its wetlands.
Mount Shibutsu (2,228 m), rising at the western edge of Ozegahara, and Mount Hiuchigatake (2,356 m), the highest peak in the Tohoku region, are both counted among Japan's 100 Famous Mountains.
The presence of these peaks creates a striking contrast between the flat wetlands and rugged mountains, deepening the signature impression of Oze's landscape.
Which Entrance Should First-Time Visitors Choose at Oze National Park?
Start from Hatomachi Pass to Explore Ozegahara
If you want to focus on walking across Ozegahara, the easiest route to picture is starting from Hatomachi Pass (Hatomachi-toge) on the Gunma side and heading down to Yamanohana.
From Hatomachi Pass to Yamanohana, the elevation drops about 200 m, with roughly a one-hour descent on foot.
Beyond Yamanohana, boardwalks continue across Ozegahara toward Ushikubi Junction, Ryugu, and Miharashi.
Start from Numayama Pass to Enjoy Lake Ozenuma
If your main goal is the scenery around Lake Ozenuma, another key entry point is the Numayama Pass (Numayama-toge) side, accessed via shuttle bus from Miike on the Fukushima side.
From Numayama Pass, it takes about one hour on foot to reach the eastern shore of Lake Ozenuma, where the Ozenuma Visitor Center is located.
Visitors coming from the Gunma side can also use the route from Ohshimizu, passing through Ichinose and Sanpei Pass before arriving at the southern shore of Lake Ozenuma.
Make Good Use of the Visitor Centers
Yamanohana Visitor Center provides information on Ozegahara and the Mount Shibutsu area, while Ozenuma Visitor Center serves as an information hub for Lake Ozenuma and Mount Hiuchigatake.
Both offer up-to-date details on local nature, trail conditions, and flower blooming status, making them helpful stops before you start hiking so you can plan your day more easily.
English-language materials and restrooms are also available, making these centers convenient bases for international travelers.
Check Transportation and Opening Information Before You Go
At Oze, the lifting of winter road closures, shuttle bus operations, and the opening schedules of public restrooms and visitor centers all change with the seasons.
The general hiking season runs from mid-May to late October, and factors such as private car restrictions near Hatomachi Pass and the shared bus and taxi services from Togura vary depending on the time of year.
Checking transportation and facility information in advance makes it much easier to choose your entry point and plan your day on-site.
Seasonal Scenery at Oze National Park
Oze offers seasonal highlights such as mizubasho (Asian skunk cabbage), watasuge (cotton grass), nikko-kisuge (daylilies), and kusa-momiji (autumn wetland colors).
From late spring to early summer (late May to mid-June), mizubasho come into bloom; from late June to early July, the white tufts of watasuge appear; from mid- to late July, golden fields of nikko-kisuge spread across the marsh; and from late September to early October, the entire wetland turns a rich reddish-brown in the kusa-momiji autumn display, each season creating a dramatically different impression.
Even within the same Oze, where you walk depends on what you want to see, whether it's flowers, the vast wetland panorama, or autumn foliage.
When deciding where to go, it helps to plan around the scenery you most want to experience, such as Ozegahara, Lake Ozenuma, or the Mount Shibutsu area.
Rules and Etiquette to Follow at Oze National Park
To protect the wetlands at Oze, it is essential to stay on the boardwalks and carry out all trash.
Within the national park's Special Protection Zones, collecting plants and animals is prohibited, and even picking up fallen branches is not allowed.
Public restrooms at Oze operate on a donation basis, and visitors are asked to contribute about 100 yen per use as a cooperation fee.
Mountain huts generally require advance reservations, and camping outside of designated areas is prohibited. Camping is only permitted in three locations: Yamanohana, Miharashi, and the eastern shore of Lake Ozenuma.
The campsite on the eastern shore of Lake Ozenuma requires reservations, and at all designated sites, open fires and leaving food waste behind are strictly prohibited.
On mountain trails, hikers are asked to use rubber caps on trekking poles and remove crampons in snow-free areas to avoid damaging the boardwalks and vegetation.
Since Asian black bears inhabit the area, it is also important to carry a bear bell, avoid hiking alone in the early morning or evening, and stay informed of local safety updates.
How to Get to Oze National Park and What to Wear
Access to the Main Entrances
To reach Hatomachi Pass, most visitors take a bus from Jomo-Kogen Station or Numata Station on the JR Joetsu Line to Togura, then transfer to a shared bus or taxi.
For the Numayama Pass side, take the Aizu Bus from Aizu-Kogen-Ozeguchi Station (Yagan Railway) to Miike, then transfer to the shuttle bus for Numayama Pass.
Because travel from the Tokyo area takes considerable time, many visitors combine the trip with a stay at a nearby inn or a mountain hut the night before.
Clothing and Gear
The wetlands of Oze sit at about 1,400 m elevation, with peaks rising above 2,000 m, so even in midsummer the mornings and evenings can feel chilly.
It is a good idea to prepare quick-drying long sleeves and long pants, rain gear (separate top and bottom), non-slip trekking shoes, drinking water, trail snacks, a map, and a headlamp as your basic kit.
Boardwalks become slippery when wet, so walk carefully, especially during rain or in the early morning when dew is still on the wood.
