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The Sonomama Festival 2026

The Sonomama Festival 2026

◇ When

November 11, 2026

Wednesday

⌖ Where

Shima Onsen Kusushiki

Shima 3826-1, Nakanojo, Agatsuma

四万温泉 くすしき
群馬県 吾妻郡中之条町 吾妻郡中之条町四万3826-1

⌖ Open in Maps ↗
Held in the Shima hot spring area of Gunma Prefecture, the unique Sonomama Festival invites participants to write their usual titles on paper and float them down the river. People freely play on a large sheet of Japanese paper while smearing mud on each other. The event encourages letting go of daily roles and societal expectations to simply be human for a day. Starting in 2025, this will be its second year. Visitors can join the mud play or observe only. Afterward, participants can enjoy bathing in the Shima hot springs.
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