That's total realism, with a Naval mod that changes, suprise suprise, naval infastructure and combat quite thoroughly and those little villages without names are from the Metropolis mod that removes walls from all but the the ones that historically had them and also changes how the game treats some economical aspects, like farming. It's pretty hard, since you can be sieged and attacked the same turn for most cases, cities with walls become very precious. It's optional though.