Lagoa Verde is a spot of shallow, calm, typically green waters and is one of the highlights of the northwest coast of Ilha Grande, very close to Araçatiba Bay.

Lagoa Verde (Green Lagoon) is also a tourist nickname, like Lagoa Azul (Blue Lagoon). Its geographic name is Ilha da Longa (Long Island). At normal or high tide, it's separated from Ilha Grande; at low tide, it's joined by a narrow strip of sand and rocks. It's one of the few places on the planet where greenish corals are found, hence the name. The marine fauna is a spectacle in itself, thanks to the shallow depths of its clear, calm waters.