Dokushima Tenkodo in Nishiizu Town is a cave made of volcanic ash created by an underwater volcano. The cave's name comes from the "tenkado" or "heavenly window" in the ceiling, which allows light to shine through and illuminate the emerald green sea surface, creating a fantastic view. When entering by sightseeing boat, you'll be enveloped in a space of silence and mystery. Additionally, you can enjoy the beauty of the water color and strange rocks, which subtly change depending on the season and time of day.
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