Are mages in Runeterra more common in specific regions?

It's been made clear that places like Demacia have a problem with mages, while other places seem to have very little? Or maybe because they're not a problem they're underrepresented. Like, take Piltover and Zaun for example. I don't think there's any mages from there, now that Janna is no longer a mage in her lore. Every champ that is a mage in gameplay actually just uses technology. Does this mean there are no mages in these regions, or are they there and we just don't know about it?
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