Katagata-numa, a hidden gem in Osaki City. This caldera lake, where the smell of sulfur hangs in the air, creates a fantastic scene in winter with frost sparkling on the surface. The beautiful sight, created by the lake water with one of the highest levels of acidity in the world, is truly breathtaking. Enjoy a nature walk or boat ride while experiencing the mysterious world created by the strong acidic lake water and frost.
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