Nagatoro River Rafting — Arakawa Gorge Rapids

**Course selection:** Two courses are offered. Course A (3km, 20 min) covers the upper section with gentler rapids — suitable for young children and those seeking mild excitement. Course B (6km, 40 min) includes Course A plus the lower section with larger rapids and the most dramatic rock formations. First-timers should choose Course B if comfort with water splashing — the full experience justifies the extra ¥1,300. Course B departs from Oyahana Bridge; Course A from Nagatoro Station. **Water level timing:** Spring (April–May) brings snowmelt from Chichibu mountains — highest water levels and most aggressive rapids. This is when experienced rafters visit. Summer (July–August) has lower, warmer water — family-friendly but less thrilling. Autumn (October–November) water levels vary by rainfall; check the rafting company website for current conditions. Winter is closed due to cold and low water. **Getting wet:** You WILL get splashed — waterproof bags provided for belongings but expect clothes to get damp. Dress in quick-dry fabrics; avoid cotton. Change of clothes recommended (coin lockers at station, ¥300). The boats have no motors — boatmen use traditional pole techniques learned over years. Tipping is not expected but appreciated for exceptional skill (¥500 discreetly handed at end). **Rock formation viewing:** After rafting, walk the riverside Iwadatami (岩畳, 'rock tatami mat') — a 500-meter exposed limestone shelf where you can walk on the tilted sedimentary layers. The layered rock creates natural steps and platforms above the river. Geologists study these formations; casual visitors simply enjoy the alien landscape. Accessible year-round for free along the eastern riverbank.