the largest lagoon in the região dos lagos, and in fact, the largest permanent hypersaline lagoon in the world, the colossal lagoa de arraruama has an insurmountable surface area of 220 kilometers squared, and is one of the true marvels of the state. within the metropolitan limits, the most famous lagoon is the lagoa rodrigo de freitas, located in the district of lagoa, in the zona sul, the most touristic part of the city. lagoa rodrigo de freitas is one among the several popular tourism and leisure spots in rio, with several nautical and water sports clubs existing in its shores, very busy on week-ends with runners, joggers, cyclists, and people simply relaxing and enjoying the views.