Oyunuma Pond
Formed by the volcanic eruptions of Mt. Hiyori, Oyunuma Pond is a roughly pear-shaped pond around one kilometer in circumference and with a maximum depth of 22 meters. In the past, sulfur was extracted from here for use in gunpowder manufacturing. There are still sulfur vents at the bottom of the pond pumping out sulfur at a temperature of 130 degrees, and the surface temperature of the water is around 40–50°C. The white steam that rises silently from the pond, and the mud that comes bubbling up here and there, combine to give a real sense of the power of nature.
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