Ok, fine trolling man (at least I assume you're trolling, since you make absolutely zero sense), but please stop cluttering up the thread. I'm hoping for a response from Watabou, not inanities about rivers magically being attracted to cities on coasts. This is a code issue, and he might be interested in it...
Going to re-iterate the main point: The likelihood of a river going through a generated city (as opposed to outside/around it, seems to be greatly affected by whether coast is enabled or not. Probably a side effect of some code?