As there is no auto select , which civs to use you have to choose the proper ones
... so when you choose which civs to use, only select 14 without China (would be placed on the North east edge, pretending they invade Europe

because there is lot of space, which no civ ever uses, same for Kongo which is placed on the south west part in the desert ...
and Sparta (Greece) is already placed in Macedonia ( so it covers the balkan)
... that CS have a strange behavior , as it seems random HOW many are placed ...
I have games where ALL are there, but now I am playing with my brother and GENEVA and LISBON is already missing (what we have found out at the moment), but maybe it is because we are playing MP with 16 civs ...
BUT with the above coordinates, really all have enough space, nothing is overlaped and each TSL is at least 5 hexes away from the next starting position ...
All CS have different UNIQUE TRAITS (like Granada has, that you could built Alcazar), so it is sad, when one is missing and with the feature of the Europe map from
@Gedemon each CS even gets the correct name, so Amsterdam is most Rotterdam and Brussels, something else ...
... for spawning of resources on flood plains, only gedemon would be able to prevent that, but as long as it isn't a strategic resource a builder could at least remove it and you could use the hex normal !
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QUESTION : Does anyone know, how to force the game to use a special amount of City States and not doing it random or depending how many civs I use or the size of the map ... sometimes the game uses 10 cs but also had games, where all 17 has been placed on the Europe map ?