That's awesome! Fantastic formations, and great landscape textures. The map really gives me a feel of what it'd be like to visit the place.

The only suggestion I have is to remove (or decrease the opacity and number of) the woodcut lines around the coasts; with such complex coastlines and so many islands almost touching, they become rather confusing. The land and sea colors are different enough to clearly show where the coasts are without the extra lines.

As for where the cities would be, I imagine those huge bridges would be the starting point of quite a few. River mouths and protected fjords are always good places too, and smaller villages tend to form at distances from each other of one or a half day of travel.