Today's Image of the Day from NASA Earth Observatory features Lake Chad in central Africa. The photograph was taken by an astronaut on the International Space Station. According to NASA, Lake Chad once ranked among the largest natural lakes in the world. It was a critical resource for millions of people and animals, supporting agriculture and fishing across the region.  Lake Chad straddles the borders of Chad, Nigeria, Niger, and Cameroon. The shallow lake is primarily fed by the Chari River, which brings...