Lake Tazawa (Tazawa-ko) in Senboku, Akita Prefecture, reaches a depth of 423 meters, making it the deepest lake in Japan. It is not certain how it was formed: Though it has been said to be a volcanic caldera, some think it is a crater formed by the impact of a meteorite. On a clear day, the surface of Lake Tazawa reflects the sky with a brilliant cobalt blue. The lake is also strikingly beautiful at dawn. First the sky brightens in the east, and then the sun rises from behind the mountains, casting a ripp
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