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Shiretoko NP, Hokkaido
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In 1936, molten sulfur from Shiretoko-Io flowed down Kamuiwakka Creek to the Sea of Okhotsk. JMA records repeated sulfur, boiling-water and steam bursts from May to October, estimating total sulfur output at about 200,000 tonnes.
The green streaks on the rocks aren’t moss: researchers found photosynthesizing red microalgae living in Kamuiwakka’s sulfur-rich water, below pH 2. Their cell walls collect silica, forming a delicate mineral crust.
After the 1936 eruption, miners used two transport systems to haul sulfur from the creek and crater toward Kamuiwakka Bay: mine carts and aerial cableways. A museum study documents surviving traces, including rails, cable, concrete and stonework.
Kamuiwakka is a creek that warms upstream: the first cascade is lukewarm, while water at the fourth can approach 40°C. Hot spring water from volcanic Mt. Shiretoko-Io feeds the stream.
Shari’s local museum traces Kamuiwakka to the Ainu words kamuy.wakka and records its meaning as “water of god (or demon).” The parenthetical preserves a more nuanced gloss than the familiar “Water of the Gods.”
At its peak, Kamuiwakka drew an estimated 100,000 river visitors a year. Rockfall concerns closed the upper cascades in 2006; access to the fourth waterfall returned in July 2023 as a managed, reservation-based activity.
