Lagoa de Carapebus is the largest lagoon within the Restinga de Jurubatiba National Park in Rio de Janeiro, Brazil, covering an area of approximately 6.5 square kilometers. It is a coastal lagoon with a connection to the Campos-Macaé Canal, indicating a marine influence. The lagoon's drainage basin includes the city of Carapebus. It is characterized by shallow, dark-colored water and is part of a unique restinga ecosystem of coastal sandbanks, marshes, and tropical forest patches. The surrounding vegetation is lush and includes endemic aquatic plants, with four species found exclusively in this lagoon. The water is officially designated as suitable for bathing and recreation, which includes kayaking and stand-up paddleboarding, as indicated by the allowance of these activities in a neighboring lagoon within the same park. The area offers a tranquil paddling environment with a focus on nature observation. Wildlife in the region includes capybara, crab-eating fox, armadillo, and a rich diversity of birds such as the scarlet ibis and the restinga antwren. The park features wide, often deserted Atlantic beaches nearby. Visitors should be aware they are within a national park, and guided ecological tours are a primary way to experience the area, implying that independent access may be regulated.