Superagüi National Park was declared a Biosphere Reservation by UNESCO in 1991.

The park has bays, deserted beaches, sandbanks, estuaries, mangroves and abundant Atlantic Forest formations.

The park is the primary habitat of the critically endangered Superagui Lion Tamarin, and hosts many other fauna and flora characteristic of the Serra do Mar subregion of the Atlantic Forest.

Prior to the arrival of Europeans it was inhabited by Carijós and Tupiniquins Indians.

In 1852, the Swiss consul in Rio de Janeiro, Perret Gentil, founded Supeargüi Island, one of the first European colonies in the state of Paraná, however, the colony didn't grow, and today the few villages that are within the park have only a few inhabitants, fishermen heirs of the 15 families brought by the consul to live in Superagui Island.