2017 Map of Sumdum B-4 NE

About this map

The vast, undeveloped terrain of the Tongass National Forest dominates this topographic study in the Petersburg Borough. The landscape is defined by extreme relief and steep drainage basins, centered on the winding course of the Chuck River as it flows through the western portion of the quadrangle. This area of Southeast Alaska is characterized by deep glacial valleys and high ridges that reach elevations exceeding 4,000 feet. The absence of roads or permanent structures reflects the protected wilderness status of the region. Detailed topographic contours reveal the complex alpine geography of the Coast Mountains, where drainage patterns are dictated by the sharp peaks and north-south trending valleys typical of the Alexander Archipelago's mainland interior.