This decorative stone engraved map shows the region at the end of its transitional border period. It features the newly formed Wyoming area that is still unnamed from its previous designation as "Attached to Dakota." In this configuration the northwestern corner is triangular and extends as a wedge between Idaho and Montana. The new territories of Idaho and Montana have no organized counties. Eastern Washington is shown with only three counties, and Oregon's eastern half has only four. The map notes places so important to navigation, including Ft. Boise, Ft. Bonneville, the Three Buttes, several gold mining areas including Elk City, and much more. The Emigrant Route, or the Oregon Trail, winds across from South Pass, following the route of the Snake River and ending at Walla Walla. Surrounded by Mitchell's attractive floral border. A scare issue showing borders which existed for a very short period.

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Condition: A

There is a hint of pleasant light toning and binding holes along the top sheet edge.