The Great Rift Valley is an approximately 6,000 km continuous geographic trench on the earth’s crust which stretches from Lebanon’s Beqaa Valley in Asia through Kenya to Mozambique in South-Eastern Africa. The vast valley holds some of the planet’s greatest lakes, plains, and mountains. The Great Rift Valley literally cuts Kenya into two. This section of the rift is referred to as the Kenyan Rift Valley and runs from north to south.
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The Kenyan Rift Valley is part of the East African Rift (Gregory Rift- eastern branch) which stretches from Northern Ethiopia to Southern Tanzania. The intra-continental ridge system was formed on the upwelling created by the Nubian, Somalian and Arabian plates. The former Rift Valley Province covered most of the Kenyan Rift Valley.
The Kenyan Rift system comprises several hills, including the Cherangani Hills, Tugen Hills, and a chain of volcanoes, some of which are still active. The rift features a mild climate with temperatures frequently below 28° C. It experiences rainfall during the October to November and March to June periods.
Escarpments enclose the valley to the east and west. A series of lakes and volcanoes lie on the rift floor. Lake Turkana occupies the northern end of the Kenyan Great Rift Valley. Lake Baringo and Bogoria lie further south of Lake Turkana and Mount Paka.
Volcanoes spread through the region in Lake Turkana and the Suguta mudflats, or Suguta Valley south of Lake Turkana. Emuruangogolak, a shield volcano, straddles the valley to the south of Suguta and further south, Mount Paka and Silali tower from the valley floor. Paka, a shield volcano, has extensive geothermal activity. Mount Korosi rise to the south of Paka. Menengai, a vast shield volcano, contains a caldera that was formed approximately 8,000 years ago. The crater is a major tourist attraction in the rift and overlooks Lake Nakuru to the South. This region also includes Lake Elmenteita, Mount Kipipiri, and Lake Naivasha.
On the South of Lake Naivasha lies the Hell’s Gate National Park and Mount Longonot, a dormant stratovolcano that erupted in the early 1900s. Suswa, a shield volcano, is located between Nairobi and Narok. In this region, lava flows from recent eruptions (less than 100 years old) are still uncovered by vegetation. Lake Magadi is the most southern rift valley lake in Kenya, although the northern end of Lake Natron in Tanzania reaches into Kenya.
Escarpments form the walls of the rift valley. The Elgeyo Escarpment forms a section of the western wall. Between the escarpment and the Tugen Hills lies the Kerio Valley at an elevation of 1,000 meters (3,300 ft.). The Kerio Valley area contains large deposits of Fluorite. A steep, natural cliff, Mau Escarpment, runs along the western edge of the Rift Valley near Lake Naivasha. It is approximately 3,000 meters (10,000 ft.) high. Further south, the Nguruman Escarpment stretches 50 km long and elongates in a northwest direction. Its northern edge is approximately 120 km southwest of Nairobi, while the southern edge is close to the Tanzanian border, at the north-western limit of Lake Natron.
The Aberdare Range forms a section of the eastern rim of the Kenyan Great Rift Valley to the north of Nairobi. Mount Satima, the highest point of the Aberdares, lies at the northern edge, and Mount Kinangop, the second-highest point, at the southern end. The mountain’s peaks form a ridge between the two peaks. Ngong Hills are peaked in a ridge along the east of the Great Rift Valley, located southwest near Nairobi.
The Great Rift Valley contains fertile soils such as Andisols as a result of moderately recent volcanic activities.
The Kenyan Rift Valley is home to eight of the total lakes in Kenya. The lakes include Lake Magadi, Lake Naivasha, Lake Elmenteita, Lake Nakuru, Lake Bogoria, Lake Baringo, Lake Logipi, and Lake Turkana from south to north. Only Lake Naivasha and Lake Baringo are freshwater, the rest alkaline. The lakes are all unique and support a staggeringly large proportion of wildlife, and famous for large flocks of flamingo that feed on crustaceans.
These lakes have waters that are rich in blue-green algae, which feed insect larvae, small crustaceans, and lesser flamingos. The larvae and crustaceans are food for fish and greater flamingos.
The three shallow alkaline lakes (Lake Bogoria, Lake Nakuru, and Lake Elmenteita) and their surrounding lands make up the Kenya Lake system. This system has one of the most diverse populations of birds globally and is the home of thirteen globally threatened species of birds. It is an important nesting and breeding site for great white pelicans and is the most important feeding area for lesser flamingos in the world. The system is home to globally important populations of African spoonbill, little grebe, black-necked grebe, little grebe, pied avocet, black-winged stilt, yellow-billed stork, gull-billed tern, and grey-headed gull.
The Kenya Lake system is a significant location on the West Asian-East African Flyway, a route followed by huge numbers of birds in their annual migration from breeding grounds in the north to wintering places in Africa. The lands around the lakes include large populations of Rothschild’s giraffe, black rhino, greater kudu, lion, cheetah, and wild dogs. The system is surrounded by the steep escarpment of the Rift Valley, which provides a spectacular backdrop and vista.
The lakes, their feeder and outlet rivers, and the rich volcanic soil are the key to life in the Great Rift Valley. Despite a decline in the total wildlife numbers due to human activities, the rift valley plains are still lush with game.