2017 Map of Prehistoric Rim

About this map

High desert drainage patterns dominate this high-plains landscape in the southwestern corner of Wyoming. The terrain is defined by the ephemeral flow of Sand Cr, which cuts through the arid basins typical of Sweetwater County's extensive public lands. Unlike more populated regions, the map highlights the vast, unpopulated character of the Western interior, focusing on the intricate topography of the prehistoric rim formations and the underlying survey grids of the Bureau of Land Management. This 2017 edition records the modern state of these remote watersheds, where the physical geography remains largely untouched by dense settlement or industrial infrastructure, offering a clear view of the natural drainage systems that have shaped the region for millennia.