[chrispedersen]

Well thats cool.. but how will they compare to standard provinces?

considering that standard provinces have 3-6 neighbors and many caves have 1-2... I think you need to make some sort of assumption as is done for seas. either they represent huge cavern systems with concomitant income etc. Or perhaps just each cave system should have a lot of resources (raw minerals et).

Although interestingly, caves act like dominion propagation wave guides.. blasting out the entrances of the caves.