1956 Map of Demarcation Point B-4

About this map

Arctic National Wildlife Range lands dominate this mid-century survey of the North Slope, revealing a landscape defined by braided glacial river systems. The Aichilik River snakes through the eastern portion of the quadrangle, while the Okerokovik River traverses the western terrain. Mapped primarily through photogrammetric methods from 1956 aerial photographs, the sheet illustrates the topographic transition from the high Brooks Range foothills toward the coastal plain. A prominent Base Line bisects the region, marking the early efforts of the Bureau of Land Management to establish land lines across this unsurveyed territory. The map serves as a primary record of the hydrological patterns of these arctic waterways before subsequent decades of environmental shifts and expanded regional oversight.