Spanning much of eastern Namibia and extending into Botswana and South Africa, the Kalahari is part of the largest continuous stretch of sand on Earth. In Namibia, the region is defined by long, parallel red dunes—known as "linear dunes"—stabilized by desert grasses and acacia trees. Because it receives more rainfall than the Namib, the Kalahari isn't a true desert but rather a semi-arid savann...
