[quote=@Mihndar]
<Snipped quote by ASTA>

Inland or on one of the two coasts? I imagine you meant inland, but access to the sea would be important for trade (and is generally more hospitable for sustaining that many people, but that doesn't matter too much).
[/quote]

Inland. Vigor City doesn't have an army, navy, air force, or merchant marine, but is relatively self-sufficient save for food imports that it probably obtains from neighboring powers.