slater777, All this data is read by the random map generator system through the object texts (zobjcts, zeobjcts, and mainly zaobjcts, which is responsible for generating them on the map). Specifying a generation of objects is not at all easy, since the RMG algorithm is hardcoded deep in the core of H3 and any alteration will be irreversible. It is for this main reason that Third Upgrades mod not even Wake of Gods in their time had the courage to alter the generation of objects for their own benefit or else we would not be using scripts for replacement of objects.