Lake Victoria
Africa's largest lake and a source of the Nile
Lake Victoria is the inland heart of East Africa — Africa's largest lake, the world's largest tropical lake, and a shallow freshwater sea shared by Tanzania, Uganda, and Kenya. Its waters lap the equator and feed the White Nile, making this broad, hazy expanse one of the headstreams of the longest river on Earth. Around it live tens of millions of people, and on it float fishing dhows, ferries, and a fishing industry built around a single introduced predator. For a lake so vast, it is startlingly young and startlingly shallow.
Unlike the deep rift lakes to its west, Victoria sits in a broad, gentle depression rather than a tectonic gash, which is why it spreads across nearly 60,000 square kilometres yet reaches a maximum depth of only about 81 metres. Geologically it is a youngster, having dried out completely as recently as 17,000 years ago before refilling. Its shallowness makes it sensitive: evaporation, rainfall, and the outflow at Jinja, where the Nile begins, keep its level in delicate balance. The lake once teemed with hundreds of endemic cichlid species in one of evolution's great natural experiments.
That experiment was upended in the 20th century. The Nile perch, introduced to boost fisheries, drove many of the native cichlids toward extinction even as it created a booming export trade in fillets. Water hyacinth choked harbours, and pollution from the growing cities of Kampala, Mwanza, and Kisumu has strained the ecosystem further. John Hanning Speke reached its shores in 1858 and named it for his queen while arguing that it fed the Nile — a claim that took years of expeditions to confirm. Today the lake remains an economic lifeline and an environmental cause for concern in equal measure.