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2021 Map of Sumdum A-3 SW

Name: 2021 Topographic Map of Sumdum A-3 SW
Creator: U.S. Geological Survey
Published: 2021
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2021

About this map

Tongass National Forest dominates this coastal landscape in the Petersburg Borough, where glacial-carved peaks meet the waters of the Inside Passage. The terrain is defined by high-elevation summits such as Jefferson Peak, Hancock Peak, and Fulton Peak, which overlook a network of alpine lakes including De Boer Lake and Spurt Point Lake. Along the eastern shoreline, the waters of Thomas Bay and Porter Cove provide access to the wilderness via the Spurt Lake Trl.

Maritime navigation is marked by prominent landforms like Point Vandeput and Wind Point, which frame the entrance to the bay. The map illustrates a landscape shaped by significant relief, where drainage patterns flow from peaks like Marsh Peak and Pierce Peak toward the coast. This study captures the area's geography as it appeared in the early 21st century, detailing the primitive access routes and natural landmarks that define this portion of the Alexander Archipelago.