Igor Shpilenok,Igor Shpilenok / Kamchatka Brown Bear (Ursus arctos beringianus) recently risen from hibernation in the caldera of the Uzon Volcano. Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, April.

Igor Shpilenok / A hot spring ringed by thermophilic bacteria in the vast caldera of the Uzon Volcano, Kronotsky Zapovednik, Kamchatka, Far East Russia .

Igor Shpilenok / Steaming fissures and geysers in the caldera of Uzon Volcano, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Spring in the caldera of the Uzon Volcano, Kronotsky Zapovednik Reserve, Russia.

Igor Shpilenok / Walls of the Uzon volcano rising up above the fumeroles and hot springs in its caldera, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Thermal waters rise from a spring rimmed with a colony of thionic bacteria in the caldera of the Uzon Volcano in July, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Steaming fumeroles, hot springs, and mud kettles active in the caldera of Uzon Volcano, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) mother leads her two cubs through the caldera of the Uzon volcano, Kronotsky Zapovednik, Kamchatka, Far East Russia, autumn

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) by ranger cabin boarded up for winter, caldera of the Uzon Volcano, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Hot spring ringed by thermophilic bacteria, caldera of the Uzon Volcano, Kronotsky Zapovednik Reserve, Russia.

Igor Shpilenok / Ranger's cabin in the caldera of the Uzon Volcano, Kronotsky Zapovednik Reserve, Russia.

Igor Shpilenok / Geysers and fumeroles steaming in the caldera of the Uzon Volcano, next to lake, Kronotsky Zapovednik Reserve, Kamchatka, Russia.