Lake Malawi (or Lake Nyasa)

Lake Malawi (Lake Nyasa), Africa's third-largest and second-deepest lake (706 meters), spans Malawi, Mozambique, and Tanzania. This UNESCO World Heritage Site is a biodiversity marvel, hosting 1,000+ fish species—90% endemic, like colorful cichlids studied by Darwin. Its crystal-clear waters and golden beaches draw ecotourism, while local communities rely on its fisheries. Threatened by overfishing and climate change, the lake remains a living laboratory for evolutionary biology and a lifeline for millions in the Great Rift Valley.