Chatsubomi Moss Park
Chatsubomi Moss Park
Chatsubomi Moss Park
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Chatsubomi Moss Park


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 is called "Anajigoku," or "pit of hell." It started as a deep hole created by the volcanic activity of Mount Shirane, with iron-rich spring water. Animals who fell in to the spring were unable to get out, giving the spring its hellish name. This is the only place on Honshu, Japan's main island, where chatsubomi is known to grow.

Basic Information


13-3 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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