South Island

South Island National Park occupies the volcanic South Island in the southern basin of Lake Turkana, Kenya's largest lake in Eastern Province. The park covers approximately 39 square kilometres and encompasses the entire island, which rises from the jade-green alkaline waters of Lake Turkana. Together with Sibiloi and Central Island national parks, South Island forms part of the Lake Turkana National Parks, a UNESCO World Heritage Site inscribed in 1997. The island is one of the most important crocodile breeding sites on Lake Turkana and supports one of East Africa's largest concentrations of Nile crocodiles. The island's remoteness, dramatic volcanic landscape, and unique ecology make it one of Kenya's wildest and least-visited protected areas.

South Island hosts enormous numbers of Nile crocodiles, which breed on the island's beaches and rocky shores. The population here represents one of the largest concentrations of Nile crocodiles anywhere in Africa. Hippos also inhabit the island's shallow margins. Venomous Gaboon and puff adder snakes are found on the island, requiring careful movement. Lake Turkana's fisheries support rich birdlife around South Island, including African fish eagle, various herons, cormorants, and migrant waders. Greater and lesser flamingo visit the lake's southern basin, including waters around the island, during favourable conditions. The island's sparse vegetation provides minimal habitat for terrestrial mammals.

South Island's vegetation is extremely sparse, reflecting the arid Turkana Basin climate and the island's volcanic substrate. Scattered doum palms (Hyphaene thebaica) are the most prominent vegetation feature, growing along lower shoreline areas where sediments accumulate. Sparse desert grasses and ephemeral herbs emerge briefly following rare rainfall events. Sparse succulent plants and halophytes (salt-tolerant plants) occupy areas near the alkaline lake shore. The island's predominantly rocky volcanic surface and alkaline soils severely limit plant establishment. Despite minimal vegetation, the island's shoreline and shallows provide important feeding and basking habitat for the large crocodile population.

South Island is a volcanic landmass formed by relatively recent basaltic lava flows, part of the same East African Rift volcanic system responsible for the numerous volcanoes along and within Lake Turkana. The island displays classic shield volcano morphology with low gradient slopes. Basaltic lava flows are exposed across much of the island's surface, and the eastern shore has jagged, rough lava formations. The island's highest point reaches approximately 90 metres above lake level. Lake Turkana itself occupies a half-graben within the Gregory Rift, bounded to the east by the Turkana Escarpment. The lake's waters are alkaline (pH 9-10) due to evaporative concentration of volcanic minerals from surrounding terrain.

South Island experiences the same extreme climate as the broader Turkana Basin. Annual rainfall is minimal — typically below 200 mm — and highly irregular. Temperatures are extreme, regularly reaching 38-42°C during the hottest months. The 'southern lake wind' is a constant feature, blowing strong southerly winds that can make lake navigation hazardous. The lake itself can become extremely rough with short, steep waves dangerous to small boats. The best period to visit is October to January when temperatures are marginally lower. Visitors must be prepared for intense heat and sun exposure at all times. Lake Turkana's jade colouration results from blue-green algal blooms (Spirulina) in the alkaline water.

The shores of Lake Turkana's southern basin were historically used by El Molo, Turkana, and Rendille communities for fishing and watering livestock. The El Molo, a small ethnic group with Cushitic origins, traditionally fished from dugout canoes and raft-like ambatches (grass and wood floats) across the lake's southern section, including around South Island. Their traditional fishing knowledge and lake navigation skills are now largely replaced by motor boats. Pokot and Samburu communities from the lake's eastern shores also accessed the island historically. British explorers including Arthur Henry Neumann and other late 19th century hunters traversed the lake's southern reaches.

South Island National Park was gazetted in 1983 to protect its exceptional crocodile population and unique island ecosystem. It was subsequently inscribed as part of the Lake Turkana National Parks UNESCO World Heritage Site in 1997, recognized alongside Sibiloi National Park and Central Island National Park. Management by Kenya Wildlife Service is challenged by the island's extremely remote location and the logistical difficulties of maintaining a ranger presence on the lake. Boat patrols from Loyangalani (a small settlement on the lake's eastern shore) are conducted periodically. Crocodile conservation here contributes to regional population monitoring of the species across Lake Turkana.

The primary draw of South Island is its extraordinary crocodile population — hundreds of crocodiles can be observed simultaneously on the island's beaches and rocks, one of Africa's most remarkable wildlife spectacles. Visiting requires a boat, typically arranged from Loyangalani (approximately 10 km from the island). The island can be circumnavigated by boat, allowing observation of different sections of shoreline and habitat. Fishing in Lake Turkana near the island offers excellent catches of Nile tilapia and Nile perch. Birdwatching around the island's shores includes fish eagles, cormorants, and various waterbirds. The volcanic landscape and jade lake scenery make for dramatic photography.

South Island is accessible by motorboat from Loyangalani, a small town on Lake Turkana's eastern shore approximately 800 km from Nairobi. Reaching Loyangalani requires a long overland journey (2+ days by 4WD from Nairobi) or a charter flight. Basic accommodation is available in Loyangalani including the Oasis Lodge. Boats can be hired in Loyangalani but lake conditions must be assessed before crossing — the lake can be dangerously rough. Kenya Wildlife Service rangers should accompany any visit to the island; crocodiles present real danger on shore. There are no facilities on South Island itself; all supplies must be brought from Loyangalani. A high degree of expedition-level preparedness is required.

South Island's principal conservation concern is the protection of the Nile crocodile population from illegal hunting for skins and eggs. The park's remoteness provides natural protection, but periodic poaching incidents are reported. The Gibe III dam in Ethiopia, by reducing water inflows to Lake Turkana, is causing lake level drops that affect the shoreline habitat critical for crocodile nesting on South Island. Climate change is intensifying aridity and lake level fluctuations throughout the Turkana Basin. Fishing communities from Loyangalani and El Molo Bay depend on the lake for food and livelihoods, requiring careful management of fishing effort near the island. Kenya Wildlife Service monitors crocodile populations through periodic aerial counts.