Mount Recheshnoi is a heavily eroded stratovolcano

Stratovolcano

A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...

 located near the center of the SW lobe of Umnak Island in the Aleutian Islands of Alaska

Alaska

Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...

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The northeast flank of Recheshnoi has one of the hottest and most extensive thermal areas in Alaska. The Geyser Bight geothermal area consists of six zones of thermal springs and two fumarolic areas along upper Geyser Creek and contains the only known geyser

Geyser

A geyser is a spring characterized by intermittent discharge of water ejected turbulently and accompanied by a vapour phase . The word geyser comes from Geysir, the name of an erupting spring at Haukadalur, Iceland; that name, in turn, comes from the Icelandic verb geysa, "to gush", the verb...

s in the state. Other thermal areas occur at Hot Springs Cove and Partov Cove on the isthmus between Recheshnoi and Mount Okmok

Mount Okmok

Mount Okmok is the highest point on the rim of Okmok Caldera on the northeastern part of Umnak Island in the eastern Aleutian Islands of Alaska, USA. This 5.8 mile wide circular caldera truncates the top of a large shield volcano...

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Sources

• Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs
• Alaska Volcano Observatory