The lagoon is an 'alluvial' lake, formed by the isolation of a coastal bay due to sediment accumulation.
It provides approximately 20% of the drinking water supply for the city of Florianópolis.
The water is naturally dark due to the high concentration of organic matter from the surrounding forest.
The park serves as a sanctuary for the Southern Muriqui, one of the world's most endangered primates.
Archaeological studies have identified remnants of sambaquis (shell mounds) around the lagoon's perimeter, indicating ancient indigenous habitation.
Lagoa do Peri is the largest freshwater lagoon on Santa Catarina Island, functioning as a primary reservoir for the southern region of Florianópolis. The surrounding area is designated as a Municipal Park, protecting one of the last remnants of Atlantic Forest in the region. The lagoon's water is classified as Class 1, meaning it is suitable for human consumption after treatment. Visitors can access a designated freshwater beach with calm, shallow waters popular for swimming. The site features various walking trails, including the path to the Sertão do Peri waterfall. The ecosystem hosts diverse fauna, including the endangered woolly spider monkey and the otter. Its geography is defined by a watershed formed by the surrounding hills, keeping the water distinct from the nearby Atlantic Ocean. The park facilities include picnic areas and basic infrastructure for families.
The wooden pier extending into the lagoon provides the clearest view of the water meeting the forest-covered hills.
Bring insect repellent as the dense vegetation around the lagoon attracts mosquitoes, particularly in late afternoon.
Wear water shoes if you plan on wading, as the lake bottom can have varying textures including mud and submerged vegetation.
Pack your own food and water, as commercial options within the park boundaries are extremely limited.
Do not attempt to swim in areas outside the marked beach, as certain parts of the lake have deep drop-offs and dense aquatic plants.
Swimming is permitted only in designated areas; motorized watercraft are strictly prohibited to protect water quality.
