The Mogollon Rim (/mʌɡɪˈjoʊn/ or /moʊɡəˈjoʊn/ or /mɒɡɒdʒɔːn/)[1][2] is a topographical and geological feature cutting across the northern half of the U.S. state of Arizona. It extends approximately 200 miles (320 km), starting in northern Yavapai County and running eastward, ending near the border with New Mexico.[3] It forms the southern edge of the Colorado Plateau in Arizona.