Beginning at Lake Mary-Clint’s Well road (FH3) and the south rim of Walnut Canyon (mp 337.5 on FH3); southeasterly on FH3 to AZ Hwy 87; northeasterly on AZ Hwy 87 to FR 69; westerly and northerly on FR 69 to I-40 (Exit 233); west on I-40 to the bottom of Walnut Canyon (mp 210.2 on I-40); southwesterly along Walnut Canyon to Walnut Canyon National Monument; southwesterly along the northern boundary of the Walnut Canyon National Monument to the south rim of Walnut Canyon; southwesterly along the south rim of Walnut Canyon to FH3.