Surrounded by arid and barren land in east Africa, Lake Turkana is the largest permanent desert lake in the world. The image above shows Lake Turkana (formerly Lake Rudolf) on December 10, 2020, as observed by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite. Like many desert lakes, Lake Turkana is a salty, closed basin. Many intact fossils have been found on Lake Turkana’s eastern shore around Koobi Fora Ridge. Today, the area around Lake Turkana is sparsely populated by people due to its isolated location and inadequate fresh water.