Last updated: April 23, 2021
Rare moss in the "pit of hell"
The Chatsubomi Moss Park is set around a natural spring with highly acidic water that supports a rare moss called chatsubomi. The deep green chatsubomi moss covers the rocks that dot the flowing spring water, creating a striking natural scene. The spring gets the name "Anajigoku," or "pit of hell," due to its extreme acidity that is inhospitable to most other life. This is the only place on Honshu, Japan's main island, where chatsubomi is known to grow.
13-3 Oaza Iriyama, Nakanojo, Agatsuma District ( Map)
About 2 hours by car from Shibukawa-Ikaho IC of Kan-Etsu Expressway
9:00 a.m. to 3:00 p.m. (closes at 2:30 p.m. October to November)
April 23-Late November, 2021
600 yen (free for children)
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