The region is marked by very extensive basins and plateaus, and a
comparatively irregular configuration of mountains. The Colorado-Green
is the dominant stream, its eastern headwaters nearly reaching the great
plains at some points in Colorado. The Platte, Arkansas-Canadian, and
Rio Grande-Pecos drain the east. The Southern Rockies offer North
America’s two lowest-elevation continental crossings, at South Pass in
Wyoming, and south of the Gila in New Mexico and Arizona.
Small - Scale is 1:1.5 million or 1" = about 23 miles
Medium - Scale is 1:1 million or 1" = about 16 miles
Large - Scale is 1:750,000 or 1" = about 12 miles
Dimensions: All map dimensions are approximate.