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Islands Connecting People and Land ‘Oki Islands Global Geopark’

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Charm of the Oki Islands Global Geopark

What Exactly is a Geopark?

A geopark is a large-scale park area that teaches us new things about the world we live in.

Geoparks are places that show us the connections between the geology of the land we live in (formed by plate tectonics and volcanic activity), the ecosystems of that land, and the lifestyles and traditions of the people who have lived, and continue to live there. To put it a little differently, they are places that show us how the Earth is put together.

Besides being places where you can discover the connections between geohistory, ecosystems, and lifestyle, geoparks also conduct environmental conservation activities, educational activities, and exciting events for local areas.

The Oki Islands Global Geopark Let’s take a trip to the Oki Islands to learn about the mysteries of the Earth!

Oki islands landscape

The Oki Islands became a Geopark because here you can learn about how the land was formed, how people and nature are connected, the wondrous Oki ecosystem, and the unique local culture. Why not come and search for the keys that will unlock the islands' mysteries?

Japan Geoparks Network (JGN)

The Japan Geoparks Network promotes national geopark activities. As of March 2013, there are currently 42 areas in Japan, including those that have been officially recognized as Japanese geoparks, which are participants in this network.

The Global Geoparks Network (GGN)

This organization is a global network of geoparks that functions under the auspices of UNESCO. Geoparks must receive authorization from the network to become members. As of March 2013, there are 90 areas in 27 countries around the world that have been recognized as global geoparks.

Oki Islands Global Geopark Summary

Boundary of the Geopark

The Oki Islands Global Geopark area (indicated by the boundary line in the map below) encompasses four inhabited and many uninhabited islands located in the Sea of Japan 40-80km north of Shimane Prefecture (south-west of mainland Honshu). As isolated islands, marine life and the fisheries industry is of central importance to the way of life of the people. In consideration of this, aside from land area, the geopark also includes 1km of sea area from the coastline. The geopark has a total area of 673.5 km2 (land area 346.0 km2 and marine area 327.5 km2).

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Features of the Oki Islands Global Geopark

The land of the Oki Islands has developed through a series of stages: from being a part of the Eurasian Continent, the land sunk to the bottom of a lake on the continent, and then the bottom of a deep sea as the Sea of Japan was formed. This land then surfaced due to volcanic eruptions, and the islands were born. They later became connected to mainland Japan during the glacial ages, to eventually become the remote islands they are today. This geohistory has given birth to the unique ecosystem and cultural traditions of the Oki Region.


The islands did not become isolated by breaking off from the mainland of Japan. Rather, changes in sea level throughout history caused them to become alternately connected to the mainland and isolated islands several times throughout history. During the last glacial age 20,000 years ago, the sea level declined 130m. As the sea between the islands and the mainland is only 70m deep, the islands became connected to the mainland Shimane Peninsula. Post-glacial warming caused the sea level to rise again 10,000 years ago and the islands became isolated as they are today.

Geohistory, Unique Ecosystem, Lifestyle & Traditions

Uncover the Mysteries of the Land!

The Oki Islands Global Geopark isn't just a place where you can see precious geological heritage. It is a place that tells the story of the land, connecting the ‘Geohistory’ of the islands created over millions of years, the ‘Unique Ecosystem’ that developed on this land, and the diverse ‘Lifestyles and Traditions’ of the people that are still present today.

In the geopark there are many ‘geosites’ where you can also learn about the geology of the land as well as the ecosystem and the lifestyles of the people who live there. There is a story to be discovered at each of the geostites.


Geohistory - Sekiheki (Red Cliff)


Unique Ecosystem - Oki Salamander


Lifestyle and Traditions – Shuhaira Dengaku