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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 Piên 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.
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