Akan Onsen Tsuruga Resort

Akan Onsen Tsuruga Resort is a premier ryokan on the shore of Lake Akan in eastern Hokkaido, where chloride and calcic volcanic spring water flows into beautifully designed indoor and outdoor baths overlooking a caldera lake famous internationally for its rare marimo algae balls — a Japanese natural monument — and framed by the UNESCO Akan-Mashu National Park's volcanic landscape of extraordinary ecological richness. The Tsuruga Resort group represents the pinnacle of Akan's onsen ryokan culture, combining architecturally sophisticated thermal bath design with exceptional Hokkaido premium cuisine featuring local venison, Akan lake fish, and seasonal alpine vegetables, alongside traditional Ainu cultural performances unique to the Akan district. Lake Akan's geothermal activity extends into the lake itself, where hot spring gases bubble up through the shallow bays creating natural thermal conditions that support the marimo spheres — algae that roll into perfect balls in the thermally agitated water — and the surrounding forest steams gently with volcanic warmth. Akan Onsen's combination of Ainu cultural heritage — the largest Ainu Kotan (village) in Hokkaido is located here — volcanic caldera scenery, marimo ecology, and high-quality ryokan hospitality makes it one of eastern Hokkaido's most culturally rich and distinctive onsen destinations.