The APA of Ilha de Cotijuba is an Environmental Protection Area (APA) located on the namesake island, one of the 42 islands that make up the insular region (329.9361 km<sup>2</sup>) of the Brazilian municipality of Belém (state of Pará). It is the third largest in the region, with an area of 15.8071 km<sup>2</sup>.
Located 22 km north of the city, access to the island is possible via boats departing from the district of Icoaraci. Since 1990, through a Municipal Law, the island was transformed into an Environmental Protection Area, which mandates the preservation of its ecosystems. It has an area of approximately 60 km<sup>2</sup> and a coastline with 20 km of practically unexplored beaches. The most famous beaches are: Praia do Vai-Quem-Quer, Praia do Farol, and Praia do Amor. These beaches offer good infrastructure, including bars, restaurants, and inns.
Cotijuba underwent significant transformations at the beginning of the 20th century, a period of great economic and social development, when it began to house the Colônia Reformatória de Cotijuba, also known as Educandário Nogueira de Farias. This institution was intended for abandoned or delinquent boys and girls (during the military dictatorship), turning it into a prison island. It is still possible to visit the ruins of the Educandário. On this island, there are two other interesting buildings in ruins. These are the ruins of the house of the former state intendant Magalhães Barata and the ruins of the "Engenho Velho."