Explore the unique rock formations carved by the Arakawa River
About this spot
This is Nagatoro's premier scenic spot, featuring unique rock formations carved by the Arakawa River over millennia, resembling tatami mats laid side by side. Designated as a National Natural Monument, it is geologically invaluable. Walking on the rocks while listening to the river's murmur and feeling the cool breeze offers respite from summer heat. As this is where the river's lanterns will later be set afloat during the festival, be sure to take in these daytime river views.
Fireworks details
Name: 長瀞船玉まつり
Date & time: 8/15 (Sat) 17:10–20:45
Venue: 秩父郡長瀞町・長瀞岩畳周辺
長瀞岩畳周辺の荒川を会場に、2026年8月15日17時10分から20時45分まで開催される、水難者供養と川の安全を祈願する伝統行事です。日が暮れるとともに川面に無数の灯籠が流され、暗闇の中に浮かび上がる灯りの帯は、荒川と山々に囲まれた長瀞ならではの幻想的な光景をつくり出します。地元で長く受け継がれてきた祭りで、静かに祈りを捧げる時間と、川辺の涼やかな夏の夜の空気を同時に味わえます。
Tips
川沿いは夜になると足元が見えにくくなるため、懐中電灯やスマートフォンのライトがあると安心です。夜は気温が下がることがあるので、薄手の羽織ものを準備しておきましょう。混雑が予想されるため、子どもと手をつないで移動しましょう。
Tips
The rock surfaces can be slippery; wear comfortable shoes. When approaching the river, watch for high-water conditions and never let small children out of sight.
Best time to visit
About 45 minutes. Afternoon sunlight beautifully highlights the contrast between rocks and water.
Access & map
〒369-1305 Saitama Prefecture, Chichibu District, Nagatoro Town, Nagatoro, Iwatatami Street
Model course featuring this spot
2026 Nagatoro Funatama Festival Full-Day Experience Course
Saitama
Explore features & model courses
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