Lake Akan
Sacred Ainu homeland with twin volcanic peaks reflected in jade waters. Home to the world's only living population of spherical marimo algae balls, thermal springs and a lakeside Ainu village where traditional crafts and dance are performed nightly.
Half day to full day
Free (Marimo Exhibition Center: ¥420; accessible by sightseeing cruise boat — boat fare charged separately)
Lake: always accessible; Marimo Exhibition Center: 6:30–18:00 (Apr 29–Nov 30, hours vary by season); sightseeing cruise: late Apr–Nov.
Year-round (ice fishing: Jan–Feb; canoe: May–Oct)
Bus from Kushiro Station (2 hrs)
Location
Why Visit
- 1
Marimo algae balls, some over 200 years old, form perfect spheres up to 30 cm across — found only here
- 2
The Ainu Kotan village preserves traditional crafts — wood carving, embroidery and spirit bear ceremonies
- 3
Yukku-an Ainu Theatre performs traditional dance nightly with live music and fire ritual
- 4
The lakeside onsen district offers open-air baths with direct lake views
Local Tips
The marimo — perfectly spherical green algae balls found naturally only here — are one of Japan's strangest natural wonders. The Ainu Kotan village on the lakeside has the most authentic Ainu cultural performances and crafts in Hokkaido. Winter ice fishing on the frozen lake (Jan–Feb) is a unique and accessible experience.
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