Kenya sits on the equator on Africa's eastern coast, bordered by Somalia to the northeast, Ethiopia to the north, South Sudan to the northwest, Uganda to the west, Tanzania to the south, and the Indian Ocean to the southeast. The country covers 580,367 square kilometers, making it the world's 48th largest nation. The equator passes through Kenya approximately 100 kilometers north of Nairobi, crossing the country from the Indian Ocean coast near the Somalia border to Lake Victoria on the western boundary. This equatorial position creates a geographic paradox: Kenya contains both permanent glaciers on Mount Kenya's summit and the Chalbi Desert's arid expanses, with temperature variation driven almost entirely by elevation rather than latitude.
The Great Rift Valley bisects Kenya from north to south, entering from Ethiopia near Lake Turkana and exiting into Tanzania south of Lake Magadi. This geological trench formed approximately 20 million years ago when tectonic forces began pulling the African continent apart. The valley floor in Kenya ranges from 450 meters above sea level at Lake Turkana to 1,890 meters at Lake Naivasha. The eastern escarpment rises abruptly from the valley floor to the central highlands, creating vertical walls visible from 50 kilometers away on clear days. The western escarpment presents a gentler slope toward Lake Victoria. The valley width varies from 30 kilometers near Lake Magadi to 80 kilometers in the Lake Turkana basin. Seismic activity continues: the 2018 crack that opened near Nairobi measured approximately 15 meters deep and continues to widen measurably each year.
Mount Kenya dominates the central highlands, reaching 5,199 meters at Batian peak. This extinct stratovolcano last erupted approximately 2.6 million years ago. The mountain contains 11 small glaciers, though they have lost 92% of their mass since 1899 when geographer Halford Mackinder made the first recorded summit. The Lewis Glacier, once Kenya's largest, measured approximately 0.1 square kilometers in 2019 compared to 0.43 square kilometers in 1934. Point Lenana at 4,985 meters serves as the most accessible summit point for trekkers without technical climbing equipment. The Kikuyu people call the mountain Kirinyaga, meaning "mountain of whiteness," and traditional belief held it as the dwelling place of their deity Ngai. British colonial cartographers transliterated this name to Kenya, which became the country's name at independence in 1963.
The Indian Ocean coastline extends 536 kilometers from the Somalia border at Ishakani to the Tanzania border south of Vanga. The continental shelf off Kenya's coast averages 15 kilometers wide before dropping to the 200-meter depth contour. Coral reefs parallel most of the coast, creating protected lagoons and white sand beaches. The Malindi-Watamu reef system extends approximately 30 kilometers and supports 250 identified coral species. Diani Beach, located 30 kilometers south of Mombasa, stretches 17 kilometers along a fringing reef with water temperatures ranging from 25 to 28 degrees Celsius year-round. The Lamu Archipelago comprises Lamu, Pate, and Manda islands plus numerous smaller islets formed from coral limestone. Tidal ranges along the Kenya coast vary from 3 meters during spring tides at Mombasa to 4.5 meters in the Lamu area.
Lake Victoria forms Kenya's western boundary, though Kenya controls only 6% of the lake's total surface area of 68,800 square kilometers. The Kenyan portion covers approximately 4,100 square kilometers in Nyanza Province. The lake reaches a maximum depth of 84 meters, with most of the Kenyan waters averaging 40 meters deep. Lake Victoria sits at 1,134 meters elevation, making it the highest large lake in Africa despite its name. The lake has no natural outlet except the Nile River, which exits at Jinja in Uganda. Kenya's portion of the lake contains numerous islands, with Mfangano Island covering 65 square kilometers as the largest. Water hyacinth, first recorded in Lake Victoria in 1988, covered approximately 10,000 hectares of the Kenyan section by 1998 before control programs reduced coverage to scattered patches by 2015.
Lake Turkana occupies the northern Rift Valley, measuring 290 kilometers long and up to 30 kilometers wide. The lake covers 6,405 square kilometers entirely within Kenya, though the Omo River that supplies 90% of its water flows from Ethiopia. Lake Turkana sits at 360 meters elevation in a basin receiving less than 200 millimeters of annual rainfall. The lake contains three volcanic islands: South Island, Central Island, and North Island. Central Island holds three crater lakes within its caldera, each with different water chemistry. Lake Turkana has no outlet, maintaining salinity levels of approximately 2,490 parts per million compared to 450 parts per million in Lake Victoria. Water levels fluctuate seasonally by up to 1.5 meters but show a declining trend since the 1975 completion of the Gibe I dam on Ethiopia's Omo River. Nile crocodiles in Lake Turkana regularly exceed 5 meters in length. The lake's distinctive jade-green color results from algae blooms in the alkaline water.
Lake Nakuru sits at 1,759 meters elevation in the Rift Valley, covering between 40 and 45 square kilometers depending on seasonal water levels. The lake's extreme alkalinity results from volcanic minerals in the surrounding drainage basin. pH levels range from 9 to 10.5, creating ideal conditions for cyanobacteria blooms that historically attracted millions of lesser flamingos. Peak flamingo counts at Lake Nakuru reached 1.5 million birds in the 1980s. However, fluctuating water levels and chemical changes have disrupted these populations. The lake nearly dried completely in the early 1950s and reached record high levels in 2013, submerging lakeshore infrastructure. Lake Nakuru National Park, established in 1961, covers 188 square kilometers surrounding the lake. The lake has no surface outlet, losing water only through evaporation.
The Tana River flows 1,014 kilometers from the Aberdare Range to the Indian Ocean north of Malindi. The river begins at elevations above 3,000 meters, descending through seven major falls including the 96-meter Adamson's Falls. The Tana delta covers approximately 1,300 square kilometers where the river splits into multiple channels before entering the ocean. Sediment deposition has built the delta seaward at rates estimated at 3 meters per century. The Tana basin drains 126,000 square kilometers, making it Kenya's most important watershed for hydroelectric generation. The Seven Forks hydroelectric scheme includes five dams along a 120-kilometer stretch of the middle Tana, with a combined capacity of 535 megawatts. The river's flow at the coast averages 5.7 billion cubic meters annually but varies substantially with rainfall patterns. The Tana flows through Garissa, where discharge measurements show peak flows exceeding 3,000 cubic meters per second during flood periods and dropping below 100 cubic meters per second in drought years.
The Aberdare Range extends approximately 100 kilometers north-south in central Kenya, with peaks exceeding 4,000 meters. Kinangop Peak reaches 3,906 meters, while Ol Donyo Lesatima stands at 4,001 meters. The range formed through volcanic activity between 3.7 and 2.1 million years ago. Heavy rainfall on the eastern slopes exceeds 2,500 millimeters annually, feeding numerous rivers that drain toward Mount Kenya. The western slopes receive less precipitation and descend toward the Rift Valley floor. Afro-alpine moorland covers elevations above 3,000 meters, characterized by giant heather and tussock grasses. Aberdare National Park, established in 1950, protects 766 square kilometers of mountain forest and moorland. The park's eastern salient extends to 2,135 meters elevation, creating an altitudinal range of nearly 2,000 meters within a single protected area.