1960 Map of Sumdum D-4

About this map

Sawyer Glacier and South Sawyer Glacier dominate this glacial landscape along the international border between Alaska and British Columbia. Located within the Tongass National Forest, the map illustrates a terrain defined by ice and water, where massive ice fields meet the fjord of Tracy Arm. The 1960 field annotation captures a specific moment in the glaciological history of the region, documenting numerous crevasses and the intricate drainage patterns of the coastal mountains. The boundary line between the United States and Canada is clearly delineated as it traverses these high-altitude ice fields, providing a critical reference for researchers studying territorial borders and wilderness preservation in the mid-20th century.