In Piauí the APA covers parts of the municipalities of Cajueiro da Praia, Ilha Grande, Luís Correia and Parnaíba.

Parnaíba is the second largest city in Piauí state and has an airport with 2 weekly (Sunday and Wednesday) flights from Campinas (São Paulo) by Azul Linhas Aereas.

[2] It adjoins the Lençóis Maranhenses National Park to the north and the Upaon-Açu/Miritiba/Alto Preguiças Environmental Protection Area to the west.

[5] The APA aims to protect remnants of alluvial forest and water resources, and to improve the quality of life of the resident populations through guidance and discipline of economic activities.

[11] Protected species in the APA include red-handed howler (Alouatta belzebul) and smalltooth sawfish (Pristis pectinata).