The Akan National Park is situated on eastern Hokkaido and covers an area of 904.81 square kilometres. In the Nationalpark are three calderas and several volcanoes.
Japan 1950, Akan Nationalpark, souvenirsheet.
The four stamps of the miniaturesheet are showing:
Akan Caldera Lake and Oakan Volcano / Kussharo Caldera Lake
Akan Caldera, Aonuma pond and Akan Fuji / Mashu Caldera Lake
The four stamps of the miniaturesheet were issued in sheets of 20 stamps as well.