Mount Sanbe

Mount Sanbe is a triple-peaked volcanic mountain within Daisen-Oki National Park in central Shimane, its three summits, Osanbe, Nakasanbe, and Kosanbe, connected by ridgeline trails that circle a caldera-like central basin. Hiking routes range from a moderate loop of the lower peaks to a full traverse connecting all three summits, with trailheads near Sanbe Onsen offering access to well-maintained paths through beech and oak forest that opens onto grassy ridge sections with panoramic views toward the Sea of Japan on clear days. A full summit hike typically takes 3 to 6 hours depending on the route chosen, and hikers should plan for a full-day outing when attempting the complete three-peak traverse. The mountain's grassy slopes turn vivid gold and red in autumn foliage season, from October into November, while spring hikes in May and June bring fresh greenery and cooler temperatures better suited to the steeper sections. The trails see moderate weekend traffic during peak foliage weekends but remain largely uncrowded on weekdays, making early starts on weekday mornings the best way to have the ridgeline largely to oneself.