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Highest point. Mount Vsevidof+

|map_caption =Satellite shot of Umnak and Unalaska Islands
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United States+
Fox Islands+ of the Aleutian Islands+
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The earliest known settlement on Umnak Island is at Anangula+ and is 8400 years old. Anangula was later abandoned and the Sandy Beach site became occupied, along with Idaliuk+ and Chaluka+. Most of the early settlements that grew up on Umnak were located along the streams. A major geologic event was the cutting of strand flats+ during the Hypsithermal+ period, about 8250 to 3000 years ago, which led to a greater natural food supply on the island for the settlers.

Umnak Island was first reached by independent Russian+ fur traders in the 1750s. Abuses by the Russians led to an alliance among Aleuts+ in the Fox Islands. In the winter of 1761-1762 the crews of four Russian ships were massacred. This include one crew on Umnak of which there were no survivors. Russian traders responded with a scorched-earth campaign in 1764 that essentially ended Aleut independence.

The modern history of Umnak Island is linked to the defense bases established by the United States during World War II+. The purpose of these forward air bases in the Aleutian Islands was not only to defend the Dutch Harbor+ but also launch attacks against the Japanese.

The US Navy+ considered this island as exclusive and as "their turf". They created a camouflage of establishing "Blair Fish Packing Co," to build airports, as forward bases, for use by the US Army Air Force during World War II. General Buckner after getting clearance from General DeWitt, built the airbases at Umnak and at Cold Bay+. With this, the garrison at Umnak had a strength of 4000, including engineering forces complemented by infantry and of field and antiaircraft artillery units, by the time the Japan+ese army enemy forces launched an attack two months later in the summer of 1942. The Japanese had been planning to attack this island in June and capture the island with the intention of maintaining an aerial patrol of North Pacific+ waters. The island was planned to become an outpost in a new area of dominance that would later include the Samoa+n and Fiji+ Islands and New Caledonia+. The Japanese were unaware of the covert preparations being made by the United States as they believed that the island was only protected by a few ships operating in Aleutian waters.

Umnak, the third largest of the Aleutian Islands after Unimak+ and Unalaska+, lies in the Fox Islands+ of the Aleutian Islands+ of the Bering Sea+, to the southwest of the larger island of Unalaska+. It is approximately convert|70

The north-northeastern part of the island contains tholeittic basaltic rocks and is characterized by tension faulting, lava flows and fragmental deposits of igneous rocks. The volcano of Mount Okmok+, characterized by its wide circular caldera+, it located in the northwestern part of the island. This generally flat central basin has an average elevation of 370 m above sea level, with the rim of the caldera reaching a height of . Following the formation of the caldera, numerous satellite cones+ and lava dome+s have formed on the flanks of the volcano. They include Mount Tulik () on the caldera's southeastern slope, Mount Idak () to the northeast, and Jag Peak. A crater lake+ once filled much of the caldera to a depth of over Convert|500|ft|m

To the north from Mount Recheshnoi, in the valley of Geyser Creek are located geothermal fields with geysers. In 1988 here were active 5 geysers up to 2 m high and 9 natural fountains up to 0.7 m high.

On Saturday July 12, 2008, Omkok Volcano on Mount Okmok+, located on Umnak, erupted for several days, through a fresh vent sending wet, ash and gas-rich plume that reached an altitude of in the air and forcing the evacuation of Fort Glenn, a private cattle ranch located on the island. Ash fell not only on the eastern part of the island but also on a fishing village on the northeast. However, the Aleut village, Nikolski, on the opposite side of Umnak Island with a population of about 40 people to the west of Okmok Volcano escaped from the southeasterly path of the ash clouds. The ash plume also disrupted operation of flights to the Dutch Harbor airport as it spread across many miles of the North Pacific.

Okmok Caldera itself had been formed and reshaped in two major eruptions which occurred 12,000 and 2,000 years ago. Direct observations of later volcanic activity are known since 1805, with 16 eruptions recorded every 10 to 20 years. The 1817 eruption deposited several feet of ash and "scoria" rock debris on the northeastern caldera rim, with ash falling on Unalaska Island. Floods that occurred during this destroyed an Aleut village at Cape Tanak on the northeast Bering Sea Coast of the island. In the recent 1997 eruption, the ash clouds traveled across the volcano's caldera floor.

In 1941, when Umnak was used as defence base by the US, the population of the province consisted of only 50 Aleutians. , United States Census Bureau the island's population further declined to 39 persons. Its only remaining community, Nikolski+, comprised the island's entire population. Fort Glenn+, a former major military facility on the northeast shore of the island, played an instrumental role in the North Pacific Theater+ in World War II+.

,. There were 28 housing units at an average density of . The racial makeup of was 30.77% White+ and 69.23% Native American+.

There were 15 households out of which 40.0% had children under the age of 18 living with them, 53.3% were married couples+ living together, 20.0% had a female householder with no husband present, and 20.0% were non-families. 20.0% of all households were made up of individuals and none had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 2.92.

In 2000, the median age was 40 years, with 35.9% under the age of 18, 30.8% from 25 to 44, 23.1% from 45 to 64, and 10.3% who were 65 years of age or older. For every 100 females there were 105.3 males. For every 100 females of age 18 and over, there were 92.3 males.

The median income for a household was $38,750, and the median income for a family was $40,250. Males had a median income of $26,250 versus $11,875 for females. The per capita income+ was $14,083. There were 23.5% of families and 20.7% of the population living below the poverty line+, including 13.6% of under eighteens and 55.6% of those over 64.

The only school on the island is in Nikolski, part of the Aleutian Region Schools+. The Nikolski School serves grades K-12. The school has one teacher who lives in a small home adjacent to the school building. The home is owned by the school district and was purpose-built for teachers and their families. The Nikolski School is in danger of extinction. Schools in rural Alaska must have at least 10 students to retain funding from the state. For the 2009–2010 school year, the Nikolski School had only nine students.

Umnak does not have a harbor. It does, however, have an airstrip, Nikolski Airport+. Building an airport runway in the hilly terrain was a unique engineering achievement of the Army Engineers, commanded by Colonel Benjamin B. Talley+. The construction work of the runway was proposed at Otter Point on the northeastern end of Umnak. Construction was started in the middle of January 1942 and was commissioned by April of the same year, being given the name Fort Glenn+. of Marsden Matting+, a perforated-steel plating (PSP), was assembled along with other steel plates and created a flat surface for aircraft to take off and land. The runway was completed on March 31, 1942 by the 807th Unit of the Army Engineers. It was long with a width of sufficient for Capt. John S. Chennault's P-40 fighter aircraft+ in the 11th Fighter Squadron to land.

*Mount Vsevidof+, the highest point of Umnak


Islands in the Bering Sea:

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