This is a wild hot spring that appears after climbing about 30 minutes up a closed forest road from Shichimi Onsen. You might wonder "Is this really a hot spring?" but when you cautiously touch the water, you can confirm it's warm and indeed a hot spring. Bathing here requires both determination and courage.
30-40 minutes from Shichimi Onsen parking lot
Walk continuously along the forest road, then leave the road partway and follow pink ribbons through the thicket, proceed along the river, and you'll find a black water pool under the rocks.
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Over 1 hour walk
This is a completely wild outdoor hot spring. You'll find yourself wondering why the water is black, but you need to make up your mind and take the plunge. There's a clean river flowing right beside it, so if you want to wash your body, there's no particular concern.