[lowfighter]

It see ms to me we can achieve maybe 10-20 meters wide rivers. If you draw with pure black one pixel wide rivers and then blur it in gimp then on some portions the river disappears altogether while the surviving water can be as narrow as 10-20 meters. So the question is how can we achieve continuous narow river? It seems to me that maybe if we can find the right gray colors pattern for that...
Any ideas or other findings?