Surprisingly, city lights make this task quite possible.
Human-made lights highlight particularly developed or populated areas of the Earth's surface, including the seaboards of Europe, the eastern United States, and Japan.
Many large cities are located near rivers or oceans so that they can exchange goods cheaply by boat.
(Editor's note: This image has generated many print requests. Unfortunately, we do not sell prints. However, a high-resolution digital version of the image is available here.
