Kilimanjaro

Mount Kilimanjaro, a large dormant volcano in Tanzania, ranks as the fourth most prominent peak on Earth and the highest volcano in the Eastern Hemisphere. Its summit reaches 5,895 meters (19,341 feet) above sea level, making it Africa’s tallest mountain and the world’s highest free-standing mountain above sea level, rising 4,900 meters (16,100 feet) from its plateau base.

The Chagga Kingdoms inhabited the mountain’s southern and eastern slopes until Julius Nyerere abolished them in 1963. The name “Kilimanjaro” has an uncertain origin; it might mean “mountain of greatness” or “unclimbable.” While classical sources mention the mountain, German missionary Johannes Rebmann is credited as the first European to report its existence in 1848. Hans Meyer became the first European to reach its highest summit in 1889, following several earlier attempts.

In 1973, the mountain became part of Kilimanjaro National Park. As one of the Seven Summits, it attracts hikers and climbers via seven established routes to Uhuru Peak, its highest point. Though less technically challenging than similar peaks, Kilimanjaro’s prominence poses a serious risk of altitude sickness.

Formed by volcanic activity over 2 million years ago, Kilimanjaro is one of several mountains rising from the East African Rift. Its slopes host montane and cloud forests, and multiple endemic species live there, including the giant groundsel *Dendrosenecio kilimanjari*. The mountain features a large ice cap and Africa’s largest glaciers—Credner, Furtwängler, and Rebmann. This ice cap has shrunk by over 80% during the 20th century and is projected to vanish entirely by the mid-21st century.

The name’s meaning remains disputed. The Chagga people have no name for the whole mountain but call its two peaks Kipoo and Kimawenze, usually rendered as Kibo (“spotted,” for its snow) and Mawenzi (“broken top,” for its jagged peak). “Kilimanjaro” may come from the Chagga term *kilemanjaare* or *kilemajyaro*, meaning “unclimbable,” which explorers misinterpreted as the mountain’s name. This Kichagga etymology links *kileme* (“that which defeats”) or *kilelema* (“that which has become difficult or impossible”) with *-jaro*, possibly from *njaare* (a bird) or *jyaro* (a caravan). Early Western explanations used Swahili: in 1860, Johann Ludwig Krapf wrote that Swahilis called it Kilimanjaro, meaning “mountain of greatness” or “mountain of caravans.” In 1885, Scottish explorer Joseph Thomson offered “white mountain,” with *njaro* denoting whiteness. Critics note that *kilima* is actually a diminutive of *mlima* (mountain), meaning “hill,” though *mlima* may have been misreported as *kilima* due to confusion with the peaks’ names, Kipoo and Kimawenze. Krapf also recorded an 1849 visit with a Wakamba chief who called the mountain *Kima jajeu*, “mountain of whiteness.” Another theory suggests *jyaro* refers to a god or deity guarding the mountain. During the 1880s, the mountain became part of German East Africa and was called Kilima-Ndscharo in German. Hans Meyer named the highest summit Kaiser-Wilhelm-Spitze after Kaiser Wilhelm in 1889. Following the Zanzibar Revolution and Tanzania’s formation in 1964, the summit was renamed Uhuru Peak, meaning “Freedom Peak” in Swahili.

Geologically, Kilimanjaro is a large dormant stratovolcano with three cones: Kibo (the highest), Mawenzi (5,149 meters / 16,893 feet), and Shira (4,005 meters / 13,140 feet). Mawenzi and Shira are extinct; Kibo is dormant and could erupt again. Uhuru Peak sits on Kibo’s crater rim. The Tanzania National Parks Authority and UNESCO list its height as 5,895 meters (19,341 feet), based on a 1952 British survey. Later measurements include 5,892 meters (19,331 feet) in 1999, 5,902 meters (19,364 feet) in 2008, and 5,899 meters (19,354 feet) in 2014. A map of Kibo was published by the British Directorate of Overseas Surveys in 1964 from 1962 aerial photography. Tourist mapping first appeared from the Ordnance Survey in 1988, and West Col Productions released a map in 1990. Many other maps of varying quality have since become available.

The volcano’s interior is poorly understood due to minimal erosion exposing its igneous strata. Eruptive activity at Shira began about 2.4 million years ago, with the last major phase around 1.9 million years ago, just before the northern part collapsed. Shira is topped by a broad high plain at 3,800 meters (12,500 feet), possibly a filled caldera, with its rim deeply eroded. Before the caldera formed, Shira may have stood between 4,900 and 5,200 meters (16,100 and 17,100 feet) high. It consists mostly of basaltic lava.