Atsumi Onsen is a historic hot spring town located along both banks of the Atsumi River, about 2 kilometers inland from the Sea of Japan coast in southern Yamagata Prefecture. Surrounded by mountains and nature, the town has a peaceful atmosphere where visitors can enjoy a slower pace of life.
In the past, farmers from the surrounding area came here for toji, traditional hot spring stays for rest and recovery, particularly during agricultural off-seasons and the Bon period. They would buy fish, vegetables, mountain vegetables, and other ingredients at the morning market and prepare their own meals during their stay.
Today, seven traditional inns stand along the Atsumi River, including long-established inns housed in distinctive three-story wooden buildings. Three foot baths have also been developed in the center of the hot spring town, making it easy to enjoy the hot spring waters while walking around.
The town has been selected by the Ministry of Land, Infrastructure, Transport and Tourism as a “Kurashi no Michi Zone” and designated as a “Super Model District.” Roads have been developed with an emphasis on pedestrians, creating a pleasant environment for exploring the town on foot.
Atsumi Onsen developed along the Atsumi River, which flows through the southern part of Yamagata Prefecture. In earlier times, hot spring water naturally emerged from the riverbed. Today, the hot spring water is pumped from drilled wells and distributed to the various bathing facilities.
The name “Atsumi” is traditionally said to come from the hot spring water flowing down the Atsumi River into the sea and warming the surrounding waters of the Sea of Japan.
The opening of Atsumi Onsen is traditionally dated to 821 and is associated with the Buddhist monk Kobo Daishi. Another local legend tells of a woodcutter who discovered a crane soaking its injured shin in the hot spring water.
By the late Kamakura period, a hot spring settlement had already developed here. During the Edo period, an official hot spring administration office was established under Sakai Tadakatsu, lord of the Shonai Domain. Inns gradually appeared, and Atsumi grew into an established hot spring destination.
A morning market for hot spring visitors began in the mid-18th century. Except during the winter season, the tradition continues today, making the market an important part of the town’s identity.
Atsumi Onsen has also attracted numerous writers and cultural figures, including Akiko Yosano, Riichi Yokomitsu, and Mokichi Saito.
The hot spring wells of Atsumi Onsen are located along the Atsumi River at elevations of approximately 22 to 32 meters. Three wells are currently used, with the hot spring water centrally managed and supplied to the various bathing facilities in the town.
The temperatures at the source wells range from approximately 51.5°C to 72.9°C, while the pH values range from 7.5 to 8.3. The precise characteristics of the water vary depending on the individual source.
Atsumi Onsen is traditionally classified as a salt-containing gypsum hydrogen sulfide spring. The source temperature is relatively high, at around 60°C, and the water in the baths is also somewhat hot.
The hot spring has traditionally been regarded as beneficial for conditions such as cuts and burns. As with other Japanese hot springs, visitors should follow the bathing guidelines provided by each facility.
Atsumi Onsen is surrounded by abundant nature, and the Atsumi River provides a beautiful setting for exploring the town throughout the year.
Approximately 300 cherry trees line the river, creating a beautiful display in spring. The trees are illuminated at night, and visitors can even enjoy cherry blossoms while relaxing in one of the riverside foot baths.
In early summer, the river becomes a destination for ayu fishing, while in autumn, visitors may be able to see salmon returning upstream. Each season brings a different atmosphere to the Atsumi River.
The hot spring district also has several places to stop during a walk, including public bathhouses, foot baths, drinking fountains for hot spring water, Atsumi Onsen Shrine, and a rose garden.
There are also comfortable places to rest, including foot bath cafés and wooden decks along the river, making it easy to take a break while exploring the town.
Daishimizu Park is a small riverside-style pocket park centered around a natural spring known as Oshimizu.
The spring water was traditionally used for drinking by the lords of the Shonai Domain when they visited Atsumi Onsen for hot spring stays. Today, the site has been developed as a pleasant small park where visitors can pause during a walk around the town.
The Atsumi Onsen Morning Market is one of the town’s most distinctive attractions and has a history of approximately 260 years.
Local seasonal ingredients and regional specialties are displayed for sale, with red turnips being particularly famous.
Getting up early to stroll through the market is a great way to experience the traditional atmosphere of Atsumi Onsen and discover local foods and specialties.
The Atsumi Onsen Rose Garden is located on elevated ground overlooking the hot spring town. Approximately 3,000 roses representing around 90 varieties bloom here, generally from June through October.
In June, the garden hosts the Atsumi Onsen Rose Garden Festival, featuring a variety of events and activities.
In 2012, a rose known as the “Lord’s Rose”, associated with the Sakai family, was transplanted to the garden. It was planted again in 2022, continuing the connection between the garden and the history of the former Shonai lords.
Genroku Mochi is a soft Japanese rice cake made with ingredients such as sugar, shiratamako rice flour, and matcha green tea. Its soft texture makes it a popular traditional sweet.
Tochi Mochi is a traditional Japanese sweet made by incorporating the nuts of the Japanese horse chestnut tree, known as tochi, into mochi. The mochi is filled with smooth sweet red bean paste and served in a daifuku-style form.
Atsumi Red Turnip Pickles are a local specialty made from the distinctive red turnips grown in the former Atsumi area. The turnips are pickled with salt, sugar, and vinegar, creating a traditional preserved food with a characteristic balance of sweet, salty, and sour flavors.
Atsumi Onsen combines the traditional atmosphere of a Japanese hot spring town with beautiful riverside scenery and a long history of local culture.
Visitors can soak in the hot springs, stroll along the Atsumi River, explore the historic morning market, relax in a foot bath, and enjoy seasonal highlights such as cherry blossoms and roses.
With its traditional inns, local foods, historic customs, and peaceful natural surroundings, Atsumi Onsen offers an opportunity to experience a quieter side of Yamagata’s Shonai region.