Machine translation of the Portuguese Wikipedia article (November 2026 version).
Parnaíba is a Brazilian municipality in the state of Piauí, the second most populous in the state, with an estimated population of 172 thousand in 2025 according to IBGE. It is the main city of the Parnaíba Metropolitan Region. Located on the Piauí coast, it is one of the four coastal municipalities in the state (along with Ilha Grande, Luís Correia and Cajueiro da Praia). Parnaíba is conurbated with Luís Correia, and it is also the gateway to the Parnaíba Delta, the only delta in the Americas that opens onto the open sea, popularly known as the “Capital of the Delta”. The city has great historical value for Piauí, with numerous historic monuments listed by IPHAN, mainly in the vicinity of the Porto das Barcas.
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