Lake Tazawa — Japan Deepest Lake with Mystical Cobalt Blue Waters

In the mountains of central Akita Prefecture lies Lake Tazawa (Tazawa-ko), the deepest lake in Japan at 423.4 meters, a depth so great that the lake never freezes in winter and keeps an extraordinary clarity and color throughout the year. The water is a deep, vivid cobalt blue, a shade that intensifies toward the center and changes with light and weather in ways that have inspired legends of divine spirits dwelling in its depths.

Highlights

The legend of Tatsuko is the most beloved story of Tazawa: a beautiful young woman, praying to remain young forever, is transformed into a dragon and enters the lake, becoming its guardian spirit. Gozanoishi Shrine on the northern shore enshrines Tatsukohime-no-Kami, said to be Tatsuko in dragon form, and its vermilion torii gate standing at the water edge is striking. A gilded bronze statue of Tatsuko stands on the western shore and, together with Mount Akita-Komagatake rising beyond, forms one of the signature scenes of Lake Tazawa. The circumferential road (about 20 kilometers) can be driven or cycled, offering constantly changing views of the water, forest, and mountains. In the mountains to the east lie the Nyuto Onsen hot spring cluster and other hot springs, and combining the lake with an onsen visit is popular. The Tazawako Highland also has a ski area, drawing visitors as a snow resort in winter.

Enjoying the Seasons

Spring (April to May): The Tazawako Highland is beautiful with cherry blossoms and lingering snow, a refreshing season to visit alongside the fresh green. Summer (June to August): Lakeside activities and cruise boats can be enjoyed. This is the season when the cobalt blue is at its most vivid. Autumn (September to November): Foliage colors the surrounding mountains, and the reflected autumn scenery on the lake is superb. Winter (December to March): The Tazawako Highland ski area opens. The contrast of the snow-covered shore with the blue of the non-freezing lake is dreamlike.

Access and Basic Information

• Nearest station: Tazawako Station on the JR Akita Shinkansen (about two and a half to three hours from Tokyo). Buses run from the station to the lakeside
• Bus: Ugo Kotsu route buses run from in front of Tazawako Station to the lakeside, with services toward Gozanoishi Shrine and the Nyuto Onsen area; frequency varies by season and time, so check in advance
• By car: Via National Route 46 and other roads from the Akita Expressway direction. There are parking areas at the lakeside
• Around the lake: About 20 kilometers, which can be circled by rental bicycle or car
• Rental bicycles: Available at the lakeside information center and similar spots

Practical Travel Notes

• Best season and time: The cobalt blue looks most vivid on a clear morning. The Tatsuko statue is on the western shore and also photographs beautifully in the light of late afternoon
• Time needed: About a half day to tour the main points such as the Tatsuko statue and Gozanoishi Shrine by car, or two to three hours to cycle around the lake
• Avoiding crowds: The lakeside road and parking fill up on autumn-foliage weekends, so an early start is recommended. Pairing with Nyuto Onsen, a weekday overnight is ideal
• Clothing and gear: The lakeside is breezy and the higher highland side stays cool even in summer, so a light extra layer is reassuring
• Nearby real spots: The Nyuto Onsen area, the Tazawako Highland hot springs, and the samurai residence street of Kakunodate (within driving range) can be toured together
• Budget: Walking the lakeside is free; cruise boats, rental bicycles, and onsen bathing are extra, each roughly several hundred to just over a thousand yen

A Quick Tip

The gilded statue of Tatsuko stands on the western shore and its expression changes with the direction of the light. A one-night, two-day plan pairing Lake Tazawa with Nyuto Onsen is the top recommendation, and the lake on the morning after a relaxing onsen stay has an exceptional stillness and beauty. The cobalt blue looks clearest on a clear morning.

📚 Sources

The information here is based mainly on the public guidance from Semboku city and the Tazawako and Kakunodate tourism associations. The notices for the lakeside Tatsuko statue and Gozanoishi Shrine, and for the loop road, rental bicycles, and sightseeing boats, are also useful references. Because boat and bicycle fees and operation and nearby facility hours vary by season and year, please confirm the latest details with each facility or the tourism association before you visit.

Visitor Checklist

• Estimated time needed: About half a day to tour key points like the Tatsuko statue and Gozanoishi Shrine by car, or about 2 to 3 hours to cycle around the lake.
• What to bring: The lakeside is windy and the highland side is cool even in summer, so a layer is reassuring. Cash is handy for boats, rental bicycles, and hot springs.
• Suggested route: Visit the Tatsuko statue on the west shore and Gozanoishi Shrine on the north shore, and circle the roughly 20 km loop road by car or bicycle. Combining it with the Nyuto or Tazawako Kogen hot springs on the east side is also recommended.