1961 Map of Sumdum C-2

About this map

Boundary Peak 75 marks the rugged international divide in this sparsely labeled 1961 survey, where the high-altitude terrain is defined by the United States-Canada border. The map provides a focused look at the glaciated topography of Southeast Alaska, characterized by steep contour lines and expansive ice fields. Notably, the presence of Crevasses indicates active glacial movement and hazardous terrain at the time of the aerial photography. Because this section follows the narrow corridor of the boundary, most of the quadrangle remains blank, emphasizing the isolated nature of these peaks and the precision required by the International Boundary Commission and the U.S. Geological Survey to define this remote frontier.