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Toya Caldera Lake
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Japan map Hokkaido Toya Caldera Lake

The Toya Caldera Lake (Tōya-ko) is situated within the Shikotsu-Toya Nationalpark. The surface area is 70.7 square kilometres and 200 to 500 metres below the outer crater rim. It was formed by a gigantic eruption around 110'000 B.C.

Later repeating eruptions about 18'000 B.C. around the southern coast of the Toya Lake formed the Usu Volcano. At the eastern flank of the Usu Volcano there was formed the lava dome Showa Shinzan. 

In the middle of the Toya Caldera Lake there is an island, known as Naka Island, with its three peaks, known as Nishi, Kita and Higashi. 

 

mountainstamp.com Toya Caldera lake Yotei Volcano stamp 1971

Japan 1971, Toya Caldera Lake, Naka Island in the foreground and the Yotei Volcano in the background.

 

Japan 2008, Toya Caldera Lake, Naka Island in the foreground and the Yotei Volcano in the background.
The stamp was issued in the series
"60th Anniversary Series of the Enforcement of the Local Autonomy Hokkaido Prefecture".

Japan 2011, Toya Caldera Lake and Naka Island.
The main summits on Naka island are known as Mt. Nishi, Mt. Kita and Mt. Higahsi.
The stamp was issued in the sheet "Travel Scenes, Series 11 — Hokkaido Winter–Spring".

mountainstamp.com Toya Caldera lake stamp 2011

Japan 2011, Toya Caldera Lake and Naka Island.
The stamp was issued in the sheet "Travel Scenes Series 13 — Hokkaido Autumn-Winter". 

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