2017 Map of Petersburg D-1 NW

About this map

Tongass National Forest dominates this section of Southeast Alaska, where the high peaks of the Coast Mountains meet massive ice fields. The landscape is defined by the slow movement of glacial ice, with the LeConte Glacier flowing toward the sea in the central portion of the sheet and the Shakes Glacier appearing in the southeast. These frozen rivers have carved deep valleys and steep ridges that dictate the jurisdictional boundaries in this wilderness. The map documents the dividing line between Petersburg Borough and Wrangell Borough, which follows the high drainage divides and ridgelines. For researchers, this survey provides a modern baseline of glacial extent and mountain topography in a region where the terrain is almost entirely shaped by natural forces rather than human development.