Oki Islands — UNESCO Geopark Cliffs & Sea Caves

Published: Jun 3, 2026

Updated: Jun 3, 2026

Oki IslandsUNESCO Geoparksea cliffsremote islandsbull sumo

Oki Islands — UNESCO Geopark Cliffs & Sea Caves

Oki Islands (隠岐諸島) are a remote archipelago in the Sea of Japan, 40–80km north of mainland Shimane. The islands form a UNESCO Global Geopark showcasing volcanic and geological history spanning 600 million years. The dramatic coastline features sheer cliffs, sea caves, rock pillars, and unique rock formations created by volcanic activity and ocean erosion.

The main islands (Dogo Island and the Dozen Islands) preserve isolated culture and traditions distinct from mainland Japan, including Oki bull sumo and ancient folk songs. The isolation created unique ecosystems with endemic species. Crystal-clear waters attract divers; rugged landscapes draw hikers; and cultural preservation appeals to those seeking off-the-beaten-path Japan.

Opening Hours

Ferry (Sakaiminato): 2.5-hr crossing, 1–3 daily sailings | Coastal trails: dawn to dusk | Tourist facilities: 9:00 AM–5:00 PM

Closed: Ferry: operates year-round (reduced frequency November–March; check Nishinihon JR Bus schedule) | Bull sumo tournaments: January, August, October only

Entrance Fee

Ferry one-way: ¥3,000–4,500 (Sakaiminato–Saigo) | Kuniga Coast: free | Kuniga sightseeing boat: ¥2,500 | Rosoku-jima sunset boat: ¥3,000 | Bull sumo: ¥1,000–2,000

Best Season

May–September (calm seas, all ferry routes active, hiking season) | April–August for Rosoku-jima candle-rock sunset alignment | August for bull sumo tournament

Visit Duration

Minimum 2 days required for worthwhile visit; Dogo Island full exploration: 3–4 days; day trip from mainland not feasible

Getting There

Access Information

Ferry from Sakaiminato or Shichirui Port (2.5 hours) or flight from Izumo or Osaka (30–50 min). Multi-day visit recommended (minimum 2 days). Rental car essential for island exploration. Top sites: Kuniga Coast, Chichi-iwa rock, Rosoku-jima (candle rock at sunset), Saigo town. Accommodation: minshuku ¥7,000–10,000, ryokan ¥15,000–25,000.

Insider Guide

Premium

**Geopark significance:** Oki Islands UNESCO Global Geopark designation (2013) recognizes geological diversity — volcanic rocks from Permian period (250 million years ago), alkaline basalt formations