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2021 Map of Umnak B-1 SW, 2021 Print
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2021 Map of Umnak B-1 SW

USGS Topo · Published 2021

About this map

Hourglass Pass and Bottleneck Pass define the high-altitude crossings of this volcanic island landscape in the Aleutians West. The terrain is marked by steep elevation changes, with the land eventually descending south toward the vast shoreline of the Pacific Ocean. This 2021 survey illustrates the topographical complexity of Umnak Island, where the narrow corridors of these passes serve as the primary natural landmarks across the interior. While the map is devoid of human settlements or infrastructure, the naming of these specific mountain gaps suggests their importance for navigation through the island's interior ranges.

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Map Details

Date Portrayed2021
Date Published2021
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:25,000
Physical Dimensions24 x 29 inches

Editions of this 2021 Umnak B-1 SW Map

This is the sole edition of this map. No revisions or reprints were ever made.

Historical Maps of Umnak Through Time

320 maps found

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain