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The deepest lake in Japan. We recommend taking a 40-minute cruise on a high-speed pleasure boat from Tazawako Rest House. The emerald green water surface at the lakeside changes to a beautiful blue as you head out to sea. Because it contains aluminum, it becomes a beautiful color when reflecting sunlight. Due to the high transparency of the lake, U can clearly see the flocks of Japanese dace. In the past, Kunimasu (a type of trout) that could only be found in Lake Tazawa lived there, but when a power plant was built, acidic water from the hot springs flowed into the area, making it extinct. The scars of natural destruction can be seen in the endlessly blue lake.