| 東鳥海馬蹄形カルデラ縁上の七高山（右）と新山溶岩ドーム（左）。南西上空より。 | |
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| 内田 修・瀬尾 央・佐古清隆（1996）空撮・日本百名山。山と溪谷社、p.30-31。（参考） | |||
| Aerial view of top of Higashi Chokai Horseshoe-shaped Caldera as seen from the SW. Shichikosan (right) on the rim and Shinzan Lava Dome (left) formed in 1801. | Photo by H. Seo |
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