El Misti Location: 16.294° S, 71.409° W Elevation: 5.822 m El Misti is a symmetrical andesitic stratovolcano with  nested summit craters that towers above the city of  Arequipa. The modern symmetrical cone, constructed  within a small 1.5 x 2 km wide summit caldera that  formed between about 13,700 and 11,300 years ago,  caps older Pleistocene volcanoes that underwent  caldera collapse about 50,000 years ago. A large  scoria cone has grown with the 830-m-wide outer  summit crater of El Misti. At least 20 tephra-fall  deposits and numerous pyroclastic-flow deposits have  been documented during the past 50,000 years,  including a pyroclastic flow that traveled 12 km to the  south about 2000 years ago. El Misti's most recent activity has been dominantly pyroclastic, and  strong winds have formed a parabolic dune field of volcanic ash extending up to 20 km downwind.  An eruption in the 15th century affected Inca inhabitants living near the volcano. Some reports of  historical eruptions may represent increased fumarolic activity.   (Global Volcanism Program)  Park in Arequipa Ulla with our Arequipa-Guide agriculture around Arequipa click on pictures terrace cultivation terrace cultivation Sanbancaya and El Misti from train to Lago Titicaca El Misti from train to Lago Titicaca  Photos: Rolf Cosar                                                                                        März 1985 HOME El Misti Volcano and Arequipa, Peru. Credit: NASA