Oboke and Koboke Gorges — Marble Rock Canyons

Published: Jun 3, 2026

Updated: Jun 3, 2026

ObokeKobokegorgemarble rockYoshino River

Oboke and Koboke Gorges — Marble Rock Canyons

Oboke and Koboke Gorges — Marble Rock Canyons 2

Oboke and Koboke Gorges — Marble Rock Canyons 3

The Yoshino River has carved two dramatic gorges through western Tokushima: Oboke (大歩危, 'big steps danger') and Koboke (小歩危, 'small steps danger'), named for the treacherous cliffs that threatened Edo-period travelers. The gorge walls rise 100–200 meters, composed of crystalline schist rock streaked with white and green mineral bands, resembling marble. Sightseeing boats navigate the river between towering rock formations, with autumn foliage reflecting in the emerald water.

The gorges mark the gateway to the Iya Valley — most visitors combine gorge boat tours with vine bridge visits in a full-day excursion.

Opening Hours

Sightseeing boats: 9:00 AM - 4:30 PM (hourly departures) | Rafting tours: seasonal (Apr-Nov)

Closed: No regular closures | Boats may cancel in bad weather

Entrance Fee

Sightseeing boat: ¥1,200 adults (30 min) | Rafting: ¥6,000-9,000 (half day) | Lapis Oboke museum: ¥520

Best Season

Late October-early November (fall foliage) | April (cherry blossoms) | April-November for rafting

Visit Duration

1-2 hours (boat tour + museum) | Half day (rafting)

Getting There

Access Information

Oboke Gorge sightseeing boats: depart from Oboke Station area. 30-min tours: ¥1,200 adults, runs 9:00–16:30 (hourly departures). Koboke boats: similar pricing/schedule. Drive: 50 min from Tokushima City. Rafting tours: half-day ¥6,000–9,000 (Apr–Nov).

Insider Guide

Premium

**Boat vs. rafting:** Sightseeing boats (遊覧船, yūransen) are low-key 30-minute cruises with recorded commentary, suitable for all ages and weather. Whitewater rafting tours tackle Class III-IV rapids u