Reported by Reporter You / Compiled report
Japan’s largest cluster of coralgrass grows along the shores of Lake Notoro in Abashiri City, Hokkaido. When the autumn winds begin to blow in late August, the green stems of the coralgrass turn red, transforming the area into a vast crimson carpet.

▲ The coralgrass at Lake Notoro turns red in autumn. (Photo / Provided by the Hokkaido Tourism Organization)
Autumn isn’t just about red leaves—the sea of coralgrass shifting from green to red is also a much-cherished sight in Japan. In early autumn, around late August, as the temperature difference between day and night increases, the originally green stems of the coralgrass turn red, creating a vast crimson expanse that spreads out like a carpet. Every year in autumn, this phenomenon attracts over 200,000 visitors, making it an absolutely stunning sight that rivals the autumn foliage.
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