Zimin volcano, Stratovolcano in Kamchatka Krai, Russia.

Zimina volcano is a stratovolcano complex in the Klyuchevskaya group on the Kamchatka Peninsula. Its massif has two parts: Bolshaya Zimina in the west, with the Ovalnaya and Ostraya Zimina peaks, and Malaya Zimina in the east, also called Gorny Zub. Ovalnaya Zimina is the highest summit and has a small caldera open to the north.

The volcanic complex developed over different geological time periods, with Sharp Zimina forming as the youngest peak during the Holocene epoch. The staggered formation of these summits shaped the structure of the entire massif as it exists today.

The massif's names come from its shape: Ovalnaya Zimina for its oval summit caldera, Ostraya Zimina for its sharp peak, and Malaya Zimina, also called Gorny Zub (Mountain Tooth). Malaya Zimina is the oldest, most eroded part, a remnant of a Pleistocene volcano whose eruptive centre lay beneath today's Ovalnaya Zimina.

The massif lies in the upper reaches of the Levy Tolbachik and Gorno-Topolovaya rivers, in the southeastern part of the Klyuchevskoy Dol. Access is by off-road vehicle or helicopter from Klyuchi; the approaches cross remote volcanic terrain with no marked trails. The highest point, Ovalnaya Zimina, has a small summit caldera open to the north.

The massif has two parts: Bolshaya Zimina on the west, with the Ovalnaya and Ostraya summits, and Malaya Zimina on the east, also called Gorny Zub. Malaya Zimina is the oldest, most eroded part, a relic of a Pleistocene volcano whose eruptive centre lay beneath today's Ovalnaya Zimina.