What imaginary line crosses the Kalahari desert?

The imaginary line that crosses the Kalahari Desert is the Tropic of Capricorn. This line marks the southernmost point at which the sun can be directly overhead, occurring during the December solstice. The Kalahari Desert, located in Southern Africa, spans several countries, including Botswana, Namibia, and South Africa, and is characterized by its arid climate and unique ecosystems.