Our sources disagree on where Castelo do Piauí is governed from. If you know it, tell us with a source.
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Boundaries: Instituto Brasileiro de Geografia e Estatística (IBGE), OCHA ROLAC (https://data.humdata.org/dataset/brazil-administrative-level-0-boundaries) via geoBoundaries, CC BY 3.0 IGO (https://creativecommons.org/licenses/by/3.0/igo/); boundaries modified
Nothing has been written about Castelo do Piauí 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 Castelo do Piauí should say, and where you read it.
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