I always thought of them as being general regions, like the Sahara Desert - there isn't an official line of where the desert starts and ends.
also regarding EA's power over the game. It says in AIA
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The PRODUCERS Scot and Josh have been keeping communication between production and the execs through the weekly leads meeting. Josh has been editing together a 2 minute story reel of Stranger for the EA execs to see.
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so obviously EA has some input, or at least approval over the game. Its probably more a veto power than any actual artistic control