Our sources disagree on where Chã is governed from. If you know it, tell us with a source.
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No boundary for Chã yet
Nothing has been written about Chã here, and neither Wikipedia nor Wikivoyage has an article we could draw one from. If you know the place, that makes you a better source than anything we have. Tell us what is worth knowing and where you got it.
Tell us what Chã should say, and where you read it.
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