Ariz. Rev. Stat. § 11-111
Navajo county, the county seat of which is Holbrook, is bounded as follows:
Commencing at the northeast corner of Coconino county; thence east following the Utah and Arizona boundary to the one hundred tenth degree of west longitude; thence south to the former southwest corner of the Navajo Indian reservation, as established by presidential executive order dated January 6, 1880; thence east to the point intersecting the line between ranges twenty-three and twenty-four east of the Gila and Salt River Guide meridian; thence south along such range line to its intersection with the north boundary line of Graham county; thence west along the northern boundary line of Graham county to its intersection with the east boundary line of Gila county, which is the one hundred tenth degree of west longitude; thence north to intersect with the thirty-fourth degree of north latitude; thence west to intersect with the meridian of one hundred ten degrees forty-five minutes west longitude; thence north to the place of beginning.
A.R.S. § 11-111