[shivam14]

Looking at a composite night picture of the world, another river with a heavy relative concentration seems to be the Indus in Pakistan. http://apod.nasa.gov/apod/image/0011/earthlights2_dmsp_big.j...

In general, the picture provides a great insight into both the affluence and population density of various parts of the world.

[eru]

That picture is now ten years old. I wonder how affluence and population density have changed since then.

[icegreentea]

One of the great ones is looking at the Trans-Siberian Railroad. It's like the man-made version of a river (that's not a canal). It's just this string of humanity reaching across Asian.

As for the sister comment, I believe China would be twice of bright, and the lights likely extending all the way to the edge of the deserts/mountains.