| 1．Mount Iō (Akan) |
| Mount Iō (硫黄山, Iō-zan) also Mount Iwo is a volcano in the Akan Volcanic Complex of Hokkaidō, Japan. It sits within the borders of the town of Teshikaga. The mountain was once mined for sulphur, hence its name. To the Ainu the mountain was known as Atosanupuri (naked mountain). The mountain is quite bare. Despite its bareness and being a rather low mountain at 508 metres (1,667 ft) it hosts alpine plant life. It hosts colonies of Siberian Dwarf Pine, Rhododendron diversipilosum, and other members of Ericaceae.[1] |
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| 2．Lake Kussharo ・Teshikaga, Hokkaidō |
| Lake Kussharo (屈斜路湖, Kussharo-ko) is a caldera lake in Akan National Park, eastern Hokkaidō, Japan. As with many geographic names in Hokkaidō, the name derives from the Ainu language. It is the largest caldera lake in Japan in terms of surface area, and the sixth largest lake in Japan. It is also the largest lake in Japan to freeze over completely in winter. The name Lake Kutcharo is also sometimes used.[2][3] |
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| 3．Lake Mashū ・Teshikaga, Kushiro Subprefecture, Hokkaido, Japan |
| Lake Mashū (摩周湖, Mashū-ko) (Ainu: Kamuy-to) is an endorheic crater lake formed in the caldera of a potentially active volcano. It is located in Akan Mashu National Park on the island of Hokkaido, Japan. It has been called the clearest lake in the world. |
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| 4．Mount Kamui (Lake Mashū caldera) ・Hokkaido, Japan |
| Mount Kamui (カムイヌプリ, Kamui-nupuri [1]), also Kamuinupuri or Mount Mashū, a potentially active volcano, is a parasitic stratovolcano of the Mashū caldera (itself originally a parasitic cone of Lake Kussharo)[2][3][4] located in the Akan National Park of Hokkaido, Japan. Mount Kamui rose on the rim of 6 km-wide Mashū caldera, about four thousand years ago, after the collapse of Mashū volcano. Its last eruption took place about 1000 years ago.[5] |
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