Lake Yunoko in Oku-Nikko is a tranquil lake with a circumference of approximately 3 kilometers, formed when the Yukawa River was dammed by an eruption of Mount Mitsudake. In autumn, the trees surrounding the lake transform into vibrant shades of red, yellow, and brown, creating a stunning reflection of fall foliage on the water's surface. Typically, the best time to see this spectacle is from early to mid-October. During this period, visitors can enjoy the beauty of Oku-Nikko in autumn while strolling along the lakeside trails.

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