363 articles
Licancabur
Licancabur is a 5,916 m symmetrical stratovolcano on the Bolivia–Chile border in the Andean Central Volcanic Zone, with a 400 m summit crater holding one of the world's highest lakes, Inca ruins, and a normal Inca-road climbing route.
Llullaillaco
Llullaillaco, a 6,739 m stratovolcano on the Chile-Argentina border, is the world's highest historically active volcano (last eruption 1877), second-highest active volcano, site of an Inca summit sanctuary with preserved child mummies, and home to the highest-dwelling mammal.
Longavi, Nevado de
Nevado de Longaví (also Nevado de Lonquen) is a 3,175 m andesitic stratovolcano in Maule Region, Chile, last erupting 4890 BCE, with the Southern Volcanic Zone's only adakitic dacites and a 2026 seismic swarm that briefly raised its alert to Yellow.
Longs Peak
Longs Peak, 14,259 ft, highest summit of Rocky Mountain National Park and northernmost Colorado fourteener; its Class 3 Keyhole Route (14.5 mi, 5,100 ft gain) was first climbed in 1868 by John Wesley Powell.
Lonquimay
Lonquimay, active Chilean stratovolcano in the Southern Andean Volcanic Zone, 2,832 m, SE of Tolguaca; its 1988-90 Navidad cone eruption lasted 13 months, extruded ~150 million cubic meters of lava, and prompted evacuations.
Lookout Mountain
Lookout Mountain names several US features: a 2,100-foot Civil War ridge over Chattanooga, a 7,377-foot Colorado Front Range foothill, a Long Valley Caldera rhyolite volcano, a Mammoth Cave breakdown viewpoint, and a Maine summit.
Maca
Maca (Volcán Macá) is a glacier-covered stratovolcano in Aysén, Chile, on the Liquiñe-Ofqui fault zone; last confirmed eruption about 1560 CE, MAC1 tephra eruption ~1,440 cal years BP.
Mageik
Mount Mageik, a 2,165 m glacier-covered andesite-dacite compound stratovolcano in Katmai National Park, Alaska, part of the Katmai volcanic cluster near Novarupta; last confirmed eruption about 500 BCE, with fumarolic summit crater lake and uncertain 20th-century eruption reports.
Maipo
Maipo, a 5,323 m Chile-Argentina border stratovolcano southeast of Santiago, partially fills the 450,000-year-old Diamante caldera; last confirmed eruption 1912, no fumaroles, high Argentine volcanic risk rank.
Makushin
Makushin Volcano: active ice-covered stratovolcano, 1,800 m, on northern Unalaska Island, Alaska, 25 km west of Dutch Harbor; 2.5-3 km caldera formed about 8,000 years ago; 18 historical eruptions since 1786, last in 1995.
Malinche
La Malinche (Matlalcueye) is a 4,461 m dormant stratovolcano northeast of Puebla, Mexico, in the Trans-Mexican Volcanic Belt; last confirmed eruption 1170 BCE, Holocene ash about 3,100 years ago, potentially active with over 2 million people nearby.
Mammoth Mountain
Mammoth Mountain: 3,369-m trachydacite lava-dome complex on the southwest rim of Long Valley Caldera, California; last phreatic eruption ~700 years ago; CO2 tree kill and ongoing USGS-monitored unrest.
Mauna Kea
Mauna Kea (Maunakea, "White Mountain") is Hawaii's highest dormant shield volcano at 13,796 ft, a glaciated postshield volcano, a premier astronomy site with a dozen telescopes, and a sacred Native Hawaiian landscape now governed by the MKSOA.
McDonald Peak
McDonald Peak, Montana's Mission Range high point (9,794-9,820 ft, 5,614 ft prominence), an ultra-prominent summit on the Flathead Indian Reservation closed July 15-October 1 for grizzly bears feeding on army cutworm moths.
Melimoyu
Melimoyu: ice-capped Chilean stratovolcano (2,400 m, 44.08°S 72.88°W) in the southern Andean Southern Volcanic Zone near Puyuhuapi, with an 8-km buried caldera, no historic eruptions, two VEI 5 Holocene eruptions, and 2010 seismic unrest.
Michinmahuida
Michinmahuida, also spelled Minchinmávida, is a glacier-covered stratovolcano in the Palena province of southern Chile, about 17 km east of Chaitén volcano, with its last confirmed eruption in 1835.
Miniques
Miniques (Miñiques) is a 5,910 m extinct stratovolcano in Chile's Antofagasta Region, Central Andean Volcanic Arc, inside Los Flamencos National Reserve; its lava flow split the Miscanti and Miniques lagoons about 13,000 years ago; first ascent 1972.
Miravalles
Miravalles, Costa Rican andesitic stratovolcano (2,028 m) in Cordillera de Guanacaste within Guayabo caldera; last eruption a small 1946 phreatic explosion; hosts ICE geothermal field producing since 1994, up to 163.5 MW.
Misti, El
El Misti (Volcán Misti), an andesitic stratovolcano of 5,793 m immediately NE of Arequipa, Peru; last magmatic eruption 1440–1450 CE, VEI 5 Plinian event ~2030 yr BP, monitored by IGP at Green alert.
Mogote Corralitos
Mogote Corralitos is the highest peak of the Sierra de Pie de Palo, San Juan, Argentina, about 3,162-3,168 m, an ultra-prominent summit (2,468 m prominence) in Angaco Department with cold desert climate.
Mogotón
Mogotón (Cerro Mogotón, Pico Mogotón) is a mountain on the Nicaragua–Honduras border in the Dipilto-Jalapa range, Nueva Segovia; at about 2,107 m it is Nicaragua's highest point, a cloud-forest summit once mined and now climbed with guides from Ocotal.
Monarch Mtn.
Monarch Mountain, 3,555 m Coast Mountains peak in Tweedsmuir Provincial Park, British Columbia; also a Colorado ski area and The Monarch near Simpson Pass. Named by Don Munday; first ascent 1936 by Hall and Fuhrer.
Monte Pissis
Monte Pissis (Nevado Pissis) is an inactive stratovolcano on the La Rioja–Catamarca border in Argentina's Puna de Atacama; elevation disputed (6788–6882 m), third-highest Andes peak, first climbed 1937 by Osiecki and Szczepański.
Monte San Lorenzo
Mount San Lorenzo (Monte San Lorenzo, Cerro Cochrane), a 3,706 m Patagonian peak on the Chile-Argentina border near Cochrane; first ascent 1943 by de Agostini, first winter ascent 2004 by Besser's team.
Monte Sarmiento (Tierra del Fuego)
Monte Sarmiento, also Volcán Nevado, is a 2,207 m pyramidal glaciated peak at the west end of the Cordillera Darwin, Tierra del Fuego, Chile, in Alberto de Agostini National Park; first climbed in 1956, second ascent only in 2013.
Monte Zeballos
Monte Zeballos (Cerro Zeballos) is a volcanic Andean peak in Lago Buenos Aires department, Santa Cruz, Argentina, about 2,748 m high, first ascended solo by Oscar Biott in 2004, landmark of scenic Provincial Route 41.
Mount Adams (Washington)
Mount Adams (Pah-to) is Washington's largest active volcano, a 3,742 m stratovolcano 60 km east of Mount St. Helens with no historical eruptions, effusive behavior, lahar hazards, and a High USGS threat rating.
Mount Baker
Mount Baker (Kw-eq Smaenit, "White Rock") is a 3,286 m andesitic stratovolcano in Whatcom County, Washington, the northernmost and second most heavily glaciated Cascade volcano, last erupting about 6,700 years ago with 1975 unrest at Sherman Crater.
Mount Blue Sky
Mount Blue Sky, formerly Mount Evans, is a 14,265-foot peak in Colorado's Front Range about 60 km west of Denver, renamed in 2023 to honor the Arapaho and Cheyenne tribes.
Mount Caubvick
Mount Caubvick, known in Quebec as Mont D'Iberville, is a 1,652 m mountain in the Torngat Mountains on the Labrador–Quebec border, highest in both provinces.