The Barra do Una Sustainable Development Reserve is divided between the municipalities of Peruíbe (91.05%) and Iguape (8.95%) in São Paulo state.

The Ilha do Ameixal Area of Relevant Ecological Interest covers an island in the river just upstream from its mouth.

It aims to improve the quality of life of the community in a way that is harmonious and integrated with environmental conservation.

The beach is used for activities related to ecotourism such as walking, hiking, mountain biking and jeep tours.

The RDS has hostels and camping areas, bars, restaurants, grocery stores and a small marina.