The Oki Islands, part of Daisen-Oki National Park, are recognized as a UNESCO Global Geopark for their internationally valuable geological heritage and unique ecosystem. When enjoying outdoor activities such as hiking or marine sports, please respect the environment around you, be mindful of the local wildlife, and ensure your safety at all times.
Click on this link for more information on points to be mindful of and wildlife to be cautious of in the Oki Islands.
Find Oki treasures and geopark sites
The history and geology of the land that has changed shape through each time period, the rare plants and animals brought about by those changes, and the diverse local history and traditions are all precious treasures of the Oki Islands.
In Geoparks, places with wonderful scenery, rock formations, geology, and more are designated as "geopark sites." The Oki Islands has over 100 geopark sites. On this page, you can explore the geopark sites and treasures and discover the story of the Oki Islands.
Before you embark on your adventure: Cherish the rare environment and be cautious of dangerous plants and animals.
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| Age | Geology |
|---|---|
| From a Peninsula to Remote Islands | |
| 400 thousand years ago to today | Terrace and current river deposits (gravel, sand, mud) |
| Volcanic Islands Period | |
| 4.7 million to 400 thousand years ago | Alkali basalt (lava, pyroclastic rocks) |
| Inner bay to river deposits (gravel, mud) | |
| 7 to 5 million years ago | Trachyte to rhyolite (lava, intrusive rocks, pyroclastic rocks) |
| Trachyte (lava, intrusive rocks, pyroclastic rocks) | |
| Alkali basalt (lava, etc.) | |
| Quartz syenite | |
| Sandstone etc. | |
| Lake and Sea Period | |
| 26 to 12 million years ago | Conglomerate to mudstone, tuff, diatomaceous earth, etc. |
| Andesite etc. | |
| Continental Period | |
| 68 million years ago | Granite |
| 250 million years ago and earlier | Gneiss etc. |
