Volcano-Island Antsiferova with a diameter of about 3 km is located 15 km west of Peak Fuss.

The strongly truncated cone of the volcano rises to 761 m a.s.l. A summit crater with a diameter of approximately 750 m is surrounded by a crown of rocks and is wide open to the south. In the southern part of the crater there is a dome with a diameter of about 450 m, from which a small lava flow tongue extends down the slope.

Ash clouds, ash falls, pyroclastic flows, hot avalanches and lahars are a potential hazard associated with explosive eruptions of this volcano. The volcano poses a potential hazard to international and local airlines passing in the Kuriles region, since the height of its ash emissions can reach 10-15 km above sea level, ash plumes and clouds can drift hundreds and thousands of kilometers from the volcano in different directions.

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