Mount Shasta, in California, seen from the South. Located in Siskiyou County, Mt. Shasta, 14,162 feet (4317 m) is the dominant geographical feature of northern California. It anchors the southern end of the 700 mile long Cascade Range segment of the Pacific Ring of Fire. Mount Shasta is a massive compound stratovolcano composed of overlapping cones centered at four or more main vents; it was constructed during a period of more than 100,000 years. It has erupted an average of about once every