The park preserves one of the few remaining sections of the Paraná River that retains its natural hydrological regime.
It acts as a vital biological corridor for species like the marsh deer, which is considered vulnerable.
The park area contains hundreds of islands, with the largest being Ilha Grande itself.
The regional landscape includes significant archaeological sites containing remnants of ancient indigenous settlements.
The river channels in the park change configuration frequently due to seasonal flooding and sediment transport.
Ilha Grande National Park is a riverine conservation area situated in the Paraná River basin at the border between the states of Paraná and Mato Grosso do Sul. The park encompasses a complex of islands, channels, and sandbanks spanning approximately 78,000 hectares. It was created to protect the last remaining free-flowing stretch of the Paraná River before it enters the reservoir of the Itaipu Dam. The ecosystem consists primarily of riparian forests and wetlands that serve as a critical habitat for migratory bird species. Visitors can access various islands via authorized boat trips from municipalities such as Altônia, Guaíra, and Naviraí. The landscape features dynamic fluvial geomorphology that continuously alters the river's shoreline and island sizes. It is officially managed by the Chico Mendes Institute for Biodiversity Conservation (ICMBio).
The elevated sandy banks of the islands during the late afternoon when the river reflects the surrounding riparian forest.
Book boat transport through ICMBio-authorized local operators only.
Bring specialized gear for insect protection, as mosquitoes are prevalent in the riparian zones.
Ensure all trash is packed out, as there are no waste disposal services on the uninhabited islands.
Attempting to navigate the river channels with private boats without local knowledge of submerged sandbanks and shifting currents.
Visits often restricted or suspended during high-flood seasons when water levels make navigation hazardous.
Use only marked trails to protect sensitive riverbank vegetation; strictly no littering or campfires permitted.
