Arizona Constitution Art. I § 1. Designation of boundaries

Section 1. The boundaries of the State of Arizona shall be as follows, namely: Beginning at a point on the Colorado River twenty English miles below the junction of the Gila and Colorado Rivers, as fixed by the Gadsden Treaty between the United States and Mexico, being in latitude thirty-two degrees, twenty-nine minutes, forty-four and forty-five one-hundredths seconds north and longitude one hundred fourteen degrees, forty-eight minutes, forty-four and fifty-three one-hundredths seconds west of Greenwich; thence along and with the international boundary line between the United States and Mexico in a southeastern direction to Monument Number 127 on said boundary line in latitude thirty-one degrees, twenty minutes north; thence east along and with said parallel of latitude, continuing on said boundary line to an intersection with the meridian of longitude one hundred nine degrees, two minutes, fifty-nine and twenty-five one-hundredths seconds west, being identical with the southwestern corner of New Mexico; thence north along and with said meridian of longitude and the west boundary of New Mexico to an intersection with the parallel of latitude thirty-seven degrees north, being the common corner of Colorado, Utah, Arizona, and New Mexico; thence west along and with said parallel of latitude and the south boundary of Utah to an intersection with the meridian of longitude one hundred fourteen degrees, two minutes, fifty-nine and twenty-five one-hundredths seconds west, being on the east boundary line of the State of Nevada; thence south along and with said meridian of longitude and the east boundary of said State of Nevada, to the center of the Colorado River; thence down the mid-channel of said Colorado River in a southern direction along and with the east boundaries of Nevada, California, and the Mexican Territory of Lower California, successively, to the place of beginning.