2017 Map of Sumdum C-4 NE

About this map

Tongass National Forest dominates this Alaskan landscape, where the boundary between the Hoonah-Angoon Census Area and the Petersburg Borough snakes across high ridgelines. The topography is defined by the massive South Sawyer Glacier in the northeast and the dramatic coastal inlet of Fords Terror to the west. This 2017 survey by the U.S. Geological Survey illustrates the intersection of glacial ice and marine waterways in a region where human infrastructure is entirely absent. The map detail highlights the sheer elevation changes and complex drainage patterns that characterize this wilderness, providing an essential look at the shifting ice margins and geological borders that define the modern limits of these administrative districts.