Dark Water
With kelstr’s excellent better campaign map I thought the vanilla water looked quite lacking, so this can be considered a quick fix.
Better Campaign Map by kelstr: http://steamcommunity.com/sharedfiles/filedetails/?id=754870269
You may also want to check out my Chaos Water mod: http://steamcommunity.com/sharedfiles/filedetails/?id=757968850
Or even my new Virbant Water mod: http://steamcommunity.com/sharedfiles/filedetails/?id=1121378817