It contains an area of marshland at the head of the reservoir of the Eng Sérgio Motta Dam on the Paraná River.

The Cisalpina Private Natural Heritage Reserve (RPPN) is in the municipality of Brasilândia, Mato Grosso do Sul.

[7] The idea of converting the complex into a private natural heritage reserve was described by CESP in a document of 26 November 2003.

The reserve proper was limited to the land above the 259 metres (850 ft) waterline allowed for seasonal operation of the reservoir.

[9] The Brazilian Institute of Environment and Renewable Natural Resources (IBAMA) began the process of analyzing the request on 7 June 2004.

[2] The vegetation has a wide variety of species caused by climate and geomorphological changes during the Quaternary, the reserve's diverse environments and previous human occupation.

The soil and groundwater are contaminated and untreated sewage flows via the Aviação and Bom Jardim channels into the reservoir.

[13] The reserve 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.