Gruta do Acaiá
A sea cave at the western tip of Ilha Grande, where midday sunlight entering through an underwater opening turns the water inside a fluorescent blue.
Acaiá Cave lies beneath a headland at the westernmost tip of Ilha Grande. Carved by the waves, the grotto connects to the open sea through an underwater passage, so when sunlight enters at midday, the water inside glows a fluorescent blue. Access is by boat tour only. Once the boat draws near, visitors descend a rocky path into the grotto, and the cave is closed when sea conditions are rough. It is usually included in the West Route full-island boat tour along with Praia do Aventureiro and Lagoa Verde, a trip lasting about 7 to 8 hours.
Opening hours
Boat trips usually 09:00–17:00
Nearby sights
- Praia do Aventureiro
- Lagoa Verde
- Ilhas Botinas
- Ilha da Gipóia
- Capela do Senhor do Bonfim
- Saco do Céu
- Lagoa Azul
- Angra dos Reis Historic Centre