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"I saw Lake Akan’s crystal-clear caldera waters reflecting mountains and forests, and learned it is uniquely home to mysterious marimo algae balls (designated a National Special Natural Monument); scientists study these marimo—only Lake Akan is now reported to host the large marimo nearly 5 inches in diameter—and their formation remains a captivating local mystery tied to water currents." - Kristen Pope
Volcanic crater lake with hot springs, forests, and Marimo algae
Kushiro, Hokkaido, Japan Get directions