Mappe topografiche Unorganized Borough

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 70–72 miles (113–116 km) in length (117 kilometres (73 mi)) and 16 miles (26 km) wide on…

Altitudine media: 64 m

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After a period of quiescence, an intense eruption took place at Okmok in 43 BCE. A rhyodacitic eruption column rose over the volcano from a vent in its northern part. Pumice lapilli fell out from the eruption column. The fallout was emplaced in three distinct units, with a brief break between the first two…

Altitudine media: 713 m

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Mount Blackburn is a large, dramatic peak, with great local relief and independence from higher peaks. Its west face drops over 11,000 ft (3,350 m) to the Kuskulana Glacier in less than 4 horizontal miles (6.4 km). Its other faces drop 8,000–10,000 ft (2,440–3,050 m), all in less than 8 miles (13 km). The…

Altitudine media: 4’530 m

Modern Mount Wrangell, built upon the remnants of a mid-Pleistocene volcano, has an eruptive history spanning from 750,000 years ago to minor phreatic eruptions in 1884. The shield volcano features an ice-filled caldera 2.5 by 3.7 miles (4 by 6 km) in diameter at the top of Wrangell's broad summit. The caldera…

Altitudine media: 4’013 m

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It was for this latter reason that engineers chose Eagle Summit as the route to build the Steese Highway, which connects Fairbanks, Alaska to the Yukon River at Circle. In 1927, just 11 years after Stuck became one of the first Americans to navigate Eagle Summit on dog sled, the highway was completed and road…

Altitudine media: 1’068 m

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The lower elevations of Annette Island have a Marine west coast climate (Köppen Cfb), with windy and wet weather year-round, cool winters, and mild summers, and straddle the border between USDA Plant Hardiness Zones 7 and 8. Due to its southerly and maritime location, with an annual mean temperature of 47.7…

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Kasatochi Island is a member of the Aleutian Islands, which lie above a narrow ridge that separates the Bering Sea from the North Pacific. It lies at the Atka Pass northwest of the western tip of Atka Island and east of Great Sitkin Island. It is at 52.177° N latitude and 175.508° W longitude, with a summit…

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Saint Paul is the largest of the Pribilof Islands and lies the farthest north. With a width of 7.66 mi (12.33 km) at its widest point and a length of 13.5 mi (21.7 km) on its longest axis (which runs from northeast to southwest), it has a total area of 43 sq mi (110 km2). Volcanic in origin, Saint Paul…

Altitudine media: 10 m