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SOUTHERN BOUNDARY OF THE UNITED STATES MILES
Texas (along the Rio Grande, approximate)_____________ 1241
New Mexico____________________________________________ 179.5
Arizona (19.1 miles along the Colorado River)_________ 372.5
California____________________________________________ 140.4
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TOTAL 1933.4 Miles
Source: Boundaries of the United States and the Several States
Geological Survey professional paper 909: 1976
Page #23.