Yonaguni Monument
与那国島海底地形
A giant, stair-like underwater rock formation off Shinkawabana on the island's south coast. Whether it is a man-made ruin or a natural formation is still debated, and it is a famous dive site.
In 1986, divers discovered this massive stair-like rock formation off Shinkawabana on the south coast of Yonaguni Island. It lies at depths of about 5 to 25 meters and features platforms, steps, grooves and an 'arch'. Some believe it is a sunken ancient ruin, while most geologists think sandstone naturally fractured along joints to form the structure. The debate continues to this day. Certified divers can join boat dives run by local dive shops. Currents can be strong, so it is best suited to experienced divers. Those who don't dive can take a semi-submersible sightseeing boat and watch the formation through the cabin windows. From December to March, you can also combine a visit with diving for hammerhead sharks off Cape Irizaki. Reservations are needed in advance, and trips are heavily weather-dependent.
Opening hours
Boat dives or sightseeing cruises about 9:00am–4:00pm (booking required)
Nearby sights
- Tachigami Rock
- Ayamihabiru-kan
- Sanninudai & Gunkan-iwa
- Dr. Koto Clinic Set
- Tindabana
- Nanta Beach
- Cape Agarizaki & Yonaguni Horses
- Kubura Port & Kubura-bari