Activities Lake Okushima（Okushimako） is a Must-Visit Site in Shim Onsen!
Lake Okusima (奥四万湖）Lake Okushima is a famous place in the Shima Onsen resort where you can see the magical blue water in...
shima blue
Activities 
Highlight Amazing Blue /Shima Blue
As you can know because it is inside Joshinetsu Kogen National Park, Shima Onsen is the treasure box with rich nature.In...
Highlight The Water Color, Called “Shima Blue” is the Treasure of Shima Onsen
Among the nature at Shima Onsen, we are proud of the color of the water of Shima Gawa River the most. We call it “Shima...