San Francisco volcanic field
The highest peak in the field is Humphreys Peak , at Flagstaff's northern perimeter: the peak is Arizona's highest at 12 , 633 feet ( 3 , 851 m ) and is a part of the San Francisco Peaks , an extinct stratovolcano complex . 
<triplet> Humphreys Peak <subj> San Francisco Peaks <obj> mountain range <triplet> San Francisco Peaks <subj> Humphreys Peak <obj> highest point