I would like to draw a map (no kidding! ) using fractal terrain (not Fractal Terrain Pro, just fractal terrain algorithm) but not a pure random map. I mean, I already know how where the mountains/ rivers/ isles/ continents (yes, it's a full world) are. I could easily hand-draw the map but I would prefer the map to be generated by some program so I can zoom in on some more interesting part if I want. I a word, I would like to have guided fractal terrain.

do you know any program that allows me to do so ? or some good tutorial ?