How Big Is Lake Turkana? Size, Geography & Location

Lake Turkana is a large rift lake in northern Kenya, commonly measured at about 6,405 sq km in area and about 290 km in length.

Lake Turkana, Kenya.

Country: Kenya
Coordinates: 4.0500° N, 36.0167° E
Location: Northern Kenya, extending toward the Ethiopian frontier
Type: Rift lake / permanent desert lake
Area: about 6,405 sq km

Short answer

Quick answer about Lake Turkana

Lake Turkana is a large rift lake in northern Kenya, commonly measured at about 6,405 sq km in area and about 290 km in length.

It is geographically notable as Africa's largest permanent desert lake and as part of the eastern branch of the East African Rift in a hot, arid landscape.

Location: Northern Kenya, extending toward the Ethiopian frontier

Type: Rift lake / permanent desert lake

Area: about 6,405 sq km

Length: about 290 km

Region: Eastern branch of the East African Rift

Significance: Africa's largest permanent desert lake

Lake Turkana overview

Lake Turkana is a large alkaline lake in northern Kenya, occupying approximately 6,405 square kilometres and stretching roughly 290 kilometres along a north–south axis. It is the world’s largest permanent desert lake and Kenya’s largest inland water body, significant for its unique aquatic ecosystems and an extraordinary palaeoanthropological record. The lake’s high salinity and alkaline chemistry create distinctive habitats that have influenced regional biodiversity and long-term human occupation.

How big Lake Turkana is

Lake Turkana is commonly described as covering about 6,405 square kilometres and stretching roughly 290 kilometres from north to south. Those figures make it one of the largest lakes in eastern Africa and the largest permanent desert lake on the continent.

Its size matters geographically because such a large water body sits within an extremely arid rift-valley environment, creating a striking contrast between the lake surface and the surrounding desert landscape.

Lake Turkana coordinates

Lake Turkana is commonly mapped at approximately 4.0500° N, 36.0167° E, or 4.0500, 36.0167 in decimal degrees.

Degrees: 4.0500° N, 36.0167° E

Decimal: 4.0500, 36.0167

Where Lake Turkana is located

Lake Turkana lies within the northern branch of the East African Rift, centered near 3.5° north latitude and 36.0° east longitude. The basin falls mostly inside Turkana County, with portions adjacent to Marsabit County and the international boundary with Ethiopia at the lake’s northern end. The shoreline is set against rift escarpments, volcanic highlands, and the Chalbi Desert to the east. Major inflow systems form deltas along the margins, most prominently from rivers draining the Ethiopian highlands and Kenya’s interior.

Why Lake Turkana is important

Lake Turkana matters for its convergent importance to palaeoanthropology, ecology, and Earth-science research. Shoreline and terrace deposits have yielded numerous hominin fossils and stone-tool assemblages that inform interpretations of human evolution. Ecologically, the alkaline waters support specialized algae that sustain large flamingo aggregations and maintain substantial crocodile populations. Geologically, the lake occupies an active rift basin where volcanism, faulting, and rapid sedimentation provide living examples for tectonic and lacustrine studies. Culturally, local pastoralist and fishing communities have long histories of resource use linked to the lake’s ecological rhythms.

History of Lake Turkana

Lake Turkana developed as crustal extension in the East African Rift produced a fault-bounded basin that collected runoff and volcanic detritus. Regional volcanism and tectonic uplift produced alternating high-stand and low-stand lake phases, leaving layered lacustrine sediments and tuffs exposed along the shores. Those deposits preserve a deep sequence of faunal remains and hominin occupations, with archaeological traces of stone tools and repeated human settlement episodes. Over millennia the basin experienced significant hydrological fluctuation, creating palaeolake environments that recorded climatic shifts. Scientific exploration and systematic fieldwork in multiple localities subsequently documented the area’s extensive fossil and archaeological archives.

Natural features of Lake Turkana

Lake Turkana occupies an elongated, fault-controlled basin with steep rift escarpments and a largely endorheic hydrology. The lake includes several volcanic islands, broad deltaic plains where major rivers enter, and extensive mudflats and rocky shores cut into tuff and basalt. Water chemistry is strongly alkaline and saline owing to high evaporation and mineral inputs, producing saline-rich sediments and algal mats. Sedimentary sequences range from fine lacustrine silts to coarser volcaniclastics, creating stratigraphic units that preserve biological remains and archaeological materials with high fidelity.

Environment, protection, and monitoring of Lake Turkana

Portions of the lake and its immediate shoreline are legally protected as national parks and reserves that together comprise a recognised World Heritage property. Kenyan park authorities, national research institutions, and international collaborators coordinate monitoring of geological sequences, biodiversity, and archaeological sites. Conservation priorities concentrate on hydrological variability, salinization trends, and the effects of upstream land- and water-use changes on inflows. Local communities engage in resource stewardship and artisanal fisheries management, while long-term scientific programs continue palaeoenvironmental and ecological monitoring to inform management decisions.

Lake Turkana facts

The nearly complete hominin skeleton known as "Turkana Boy" was discovered on a western shore locality and remains central to studies of early Homo anatomy.
The Omo River, originating in Ethiopia, supplies the largest single inflow to the lake and creates an extensive delta at the northern margin.
The Turkana people, a Nilotic pastoralist community, occupy much of the lake basin and maintain livestock systems adapted to variable water and pasture resources.
Volcanic islands within the lake provide directly datable igneous layers that link active volcanism to fossil-bearing lacustrine stratigraphy.
A cluster of protected areas on the lake’s shores was inscribed on the World Heritage List for outstanding geological and palaeoanthropological values.

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