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The Uzon and Geyzernaya calderas, containing Kamchatka's largest geothermal area, form a 7 x 18 km depression that originated during the mid-Pleistocene. Post-caldera activity was largely Pleistocene in age, although the Lake Dal'ny maar formed during the early Holocene. This view looks from the SW across the flat caldera floor, which is dotted with numerous lakes, streams, and thermal areas. Sharp-peaked Kronotsky volcano and flat-topped Krasheninnikov volcano appear in the distance beyond the north caldera rim.

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