Uzon (Russian: Узон) is a 9 by 12 km volcanic caldera located in the eastern part of Kamchatka Peninsula, Russia. Together with the Geyzernaya caldera it hosts the largest geothermal field in the Kamchatka Peninsula. The calderas were formed in the mid-Pleistocene in several large eruptions that deposited 20–25 km³ of ignimbrite over a wide area. Lake Dalny fills a Holocene maar in the northeast of Uzon Caldera.

Uzon
The Uzon and Geyzernaya calderas. Sharp-peaked Kronotsky volcano and flat-topped Krasheninnikov volcano appear in the distance beyond the north caldera rim.
Highest point
Elevation	1,617 m (5,305 ft)
Coordinates	54°30′N 159°58′E / 54.50°N 159.97°E / 54.50; 159.97
Geography
Location	Kamchatka, Russia
Geology
Mountain type	Volcanic calderas
Last eruption	200 ± 300 years

The Uzon Caldera is a location of the occurrence of extremophile micro-organisms due to its high localized temperatures.(C.Michael Hogan. 2010)