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Rwenzori Mountains
Highest point
Peak	Mount Stanley
Elevation	5,109 m (16,762 ft)
Coordinates	00°23′09″N 29°52′18″E / 0.38583°N 29.87167°E / 0.38583; 29.87167Coordinates: 00°23′09″N 29°52′18″E / 0.38583°N 29.87167°E / 0.38583; 29.87167
Dimensions
Length	120 km (75 mi)
Geography
Rwenzori Mountains
Country	Uganda, Democratic Republic of the Congo

The Rwenzori Mountains, previously called the "Ruwenzori Range" (spelling changed around 1980 to conform more closely with the local name Rwenjura),^{[citation needed]} is a mountain range of eastern equatorial Africa, located on the border between Uganda and the Democratic Republic of the Congo (DRC). These mountains support glaciers and are one source of the river Nile.^[1]

The Rwenzori Mountains reach heights up to 5,109 metres (16,762 ft). The highest Rwenzori peaks are permanently snow-capped. The Rwenzori Mountains National Park and Virunga National Park are located in the range.

Geology

Margherita Peak on Mount Stanley is the highest point in the range.

The mountains formed about three million years ago in the late Pliocene epoch and are the result of an uplifted block of crystalline rocks including gneiss, amphibolite, granite and quartzite.^[2]

This uplift divided the paleolake Obweruka and created three of the present-day African Great Lakes: Lake Albert, Lake Edward,^[2] and Lake George.^[3]

The range is about 120 kilometres (75 mi) long and 65 kilometres (40 mi) wide. It consists of six massifs separated by deep gorges: Mount Stanley (5,109 metres (16,762 ft)), Mount Speke (4,890 metres (16,040 ft)), Mount Baker (4,843 metres (15,889 ft)), Mount Emin (4,798 metres (15,741 ft)), Mount Gessi (4,715 metres (15,469 ft)) and Mount Luigi di Savoia (4,627 metres (15,180 ft)).^[4] Mount Stanley has several subsidiary summits, with Margherita Peak being the highest point.

Human history

House and people in Kasese District, Uganda

The mountains are occasionally identified with the legendary "Mountains of the Moon", depicted in Antiquity as the source of the Nile River.^[1]

Photographer Vittorio Sella took a number of photographs of the Rwenzori Mountains during the late 19th and early 20th centuries, documenting the retreat of the range's glaciers.^[5] Sella's photographic work is conserved at the Museo Nazionale della Montagna in Turin and at the Istituto di Fotografia Alpina Vittorio Sella in Biella, both in Italy. The Makerere University, Uganda, also has a selection of his images.^[6]

The first traverse of the six massifs of the Rwenzori Mountains was done in 1975, starting on 27 January and ending on 13 February. The traverse was done by Polish climbers Janusz Chalecki, Stanisław Cholewa and Leszek Czarnecki, with Mirosław Kuraś accompanying them on the last half of the traverse.^[7]

Natural history

Flora

Lower Bigo Bog at 3400 m in the Rwenzori Mountains with giant lobelia in foreground

The Rwenzori Mountains are known for their vegetation, ranging from tropical rainforest through alpine meadows to snow. The range supports its own species and varieties of giant groundsel and giant lobelia and even has a 6 metres (20 ft) tall heather covered in moss that lives on one of its peaks. Most of the range is now a World Heritage Site and is covered jointly by the Rwenzori Mountains National Park in south-western Uganda and the Virunga National Park in the eastern DRC.^[4]

There is no water shortage in the Rwenzori; yet, several members of the afroalpine family resemble species that normally thrive in desert climates. The reason lies in their similar water economy. Water is not always readily available to the afroalpine plants when they need it. In addition, nightly frosts affect the sap transport in the plants and the intake of water by its roots. As the day begins, the air temperature and radiation level rise rapidly, putting strenuous demands on the exposed parts of the plants as they try to meet the transpiration demands of the leaves and maintain a proper water balance. To counter the effects of freezing, the afroalpine plants have developed the insulation systems that give them such a striking appearance. These adaptations become more prominent as the altitude increases.^[6]

There are five overlapping vegetation zones in the Rwenzori Mountains: the evergreen forest zone (up to 2,800 metres (9,200 ft)); the bamboo zone (2,800 to 3,300 metres (9,200 to 10,800 ft)); the heather zone (3,000 to 3,800 metres (9,800 to 12,500 ft)); the alpine zone (3,500 to 4,500 metres (11,500 to 14,800 ft)); and, the nival zone (4,400 to 5,000 metres (14,400 to 16,400 ft)). At higher altitudes, some plants reach an unusually large size, such as lobelia and groundsels. The vegetation in the Rwenzori Mountains is unique to equatorial alpine Africa.^[8]

Sources: ^[8][9][10]

Glacial recession

Ornithologist James P. Chapin on a Rwenzori expedition under flag of The Explorers Club, 1925

An ongoing concern is the impact of climate change on Rwenzori's glaciers. In 1906, the Rwenzori had 43 named glaciers distributed over six mountains with a total area of 7.5 square kilometres (2.9 sq mi), about half the total glacier area in Africa. By 2005, less than half of these were still present, on only three mountains, with an area of about 1.5 square kilometres (0.58 sq mi). Recent scientific studies, such as those by Richard Taylor of University College London, have attributed this retreat to global climate change and have investigated the impact of this change on the mountain's vegetation and biodiversity.^[11][12]

See also

• 1966 Toro earthquake

Notes

References

• 
  Glaciers of the Middle East and Africa, Williams, Richard S., Jr. (editor) In: U. S. Geological Survey Professional Paper, 1991, pp.G1-G70


• 
  Guide to the Ruwenzori, Osmaston,H.A., Pasteur,D. 1972, Mountain Club of Uganda. 200 p.


• 
  Recession of Equatorial Glaciers. A Photo Documentation, Hastenrath, S., 2008, Sundog Publishing, Madison, WI,
  ISBN 978-0-9729033-3-2, 144 pp.


• 
  Tropical Glaciers, Kaser, G., Osmaston, H.A. 2002, Cambridge University Press, UK. 207 p.


• 
  Ruwenzori, de Filippi, F. 1909. Constable, London. 408 p.


• Greenpeace article "The Death of the Ice Gigantaurs"


• BBC Article "Fabled ice field set to vanish"


• Dr Taylor's Homepage, with information about the impact of climate change on Rwenzori.


• Kaser et al. 2006, in International Book of Climatology 24: 329–339 (2004)

External links

Wikimedia Commons has media related to Ruwenzori Range.

Wikisource has the text of the 1920 Encyclopedia Americana article Ruwenzori.

• 
  World Wildlife Fund, ed. (2001). "Ruwenzoris". WildWorld Ecoregion Profile. National Geographic Society. Archived from the original on 2010-03-08.
  


• 
  UWM.edu: 1937 aerial photographs of Rwenzori Mountains — University of Wisconsin-Milwaukee Libraries Digital Collections.


• 
   Beach, Chandler B., ed. (1914). "Ruwenzori". The New Student's Reference Work. Chicago: F. E. Compton and Co.