
1) Caldera of Russia 2) Island of the Kuril Islands 3) Mountain of the Kuril Islands
Found on
https://www.crosswordclues.com/clue/shiashkotan

Shiashkotan (Шиашкотан); (捨子古丹島; Shasukotan-tō) is an uninhabited volcanic island near the center of the Kuril Islands chain in the Sea of Okhotsk in the northwest Pacific Ocean, separated from Ekarma by the Ekarma Strait. Its name is derived from the Ainu language, from `Konbu village”. ==Geology== Shiashkotan is roughly d.....
Found on
http://en.wikipedia.org/wiki/Shiashkotan
No exact match found.