[3] The Ilha Grande National Park was created by decree without number issued by the Presidency of the Republic on 30 September 1997.

The park area also includes wetlands and flood plains, situated on the banks of the Parana river, lake and lagoon waters and its surroundings and the Seawall Macaws.

Among the terrestrial fauna species were recorded as the marsh deer (Blastocelus dichotomus), the alligator-the-crop-yellow (Caiman Latorostris), the jaguar (Panthera onca), tapir (Tapirus terestris) and the giant anteater flag (Myrmecophata trydoctyla).

[1] Fishing regulations were published on 2 October 2008, covering conservation areas and their buffer zones in the Paraná River basin.

[6] The park would be part of the proposed Trinational Biodiversity Corridor, which aims to provide forest connections between conservation units in Brazil, Paraguay and Argentina in the Upper Paraná ecoregion.