paul bourke, associate professor at the university of western australia, scours google earth looking for fractal patterns, or self similarity, in the rivers systems, mountains ranges and deserts of the planet. in nature, self similarity doesn’t exist ad infinitum, as with a mandlebrot set, but branching structures are found across two, three, even four scales. paul invites people to submit their finds own to his site, which links to the pictures shown here on google earth (click pics for the country)

(learn more about fractals on “hunting the hidden dimension”, pbs nova)