This scarce map of the western United States covers a larger region than the title suggests, spanning the west coast and from Arizona to the eastern part of Montana. The map illustrates several evolving territorial boundaries. The boundary between Idaho and the new Montana territories is formed by the Bitterroot Mountains rather than the Continental Divide. The mining regions of Idaho are prominently noted. Wyoming is shown with a wedge between Idaho and Montana territories. Nevada’s eastern border is along the 115th meridian leaving an enlarged Utah and Arizona incorporates the southern tip of present-day Nevada. Tucson is the capital of Arizona with the only other settlements noted being Tubac, Vegas (Las Vegas) and Ft. Stanford. There is good detail of cities, rivers, lakes and topography throughout this interesting map. Maps from Colton’s Octavo Atlas of the World are very scarce.

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Condition: C+

The top right corner is missing with loss of the map’s neatline. There are a few spots with some light toning. The centerfold has been reinforced and there are remnants of hinge tape on verso.