One of PhotoWings' favorites, this image of Earth at Night was created with data from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS). The brightest areas of the Earth are the most urbanized, but not necessarily the most populated. Cities tend to grow along coastlines and transportation networks. Even more than 100 years after the invention of the electric light, some regions remain thinly populated and unlit. Antarctica is entirely dark. The interior jungles of Africa and South America and the deserts of Africa, Arabia, Australia, Mongolia, and USA are mostly dark, along with the boreal forests of Canada and Russia, and the great mountains of the Himalaya.