
The Colorado River carves a critical corridor through this desert landscape at the midpoint of the twentieth century, serving as the boundary between San Bernardino Co, California, and Mohave Co, Arizona. This area is a hub of transcontinental transit, where the Atchison Topeka and Santa Fe railroad and the National Old Trails Road converge near the settlement of Topock. The river geography is defined by narrow passages and wide basins, including the northern reaches of Lake Havasu and distinctive landmarks like the Needles and Cathedral Rock.
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