Arc Dome is the highest mountain of the Toiyabe Range in northwestern Nye County, Nevada, United States. It is the thirteenth-highest mountain in the state. Arc Dome also ranks as the second-most topographically prominent peak in Nye County and the eighth-most prominent peak in the state. The peak is located about 53 miles north of the community of T…Arc Dome is the highest mountain of the Toiyabe Range in northwestern Nye County, Nevada, United States. It is the thirteenth-highest mountain in the state. Arc Dome also ranks as the second-most topographically prominent peak in Nye County and the eighth-most prominent peak in the state. The peak is located about 53 miles north of the community of Tonopah, within the Arc Dome Wilderness of the Humboldt-Toiyabe National Forest.