Casimiro de Abreu () (formerly known as Barra de São João ) is a

municipality A municipality is usually a single administrative division having municipal corporation, corporate status and powers of self-government or jurisdiction as granted by national and regional laws to which it is subordinate. The term ''municipality' ...

located in the

Brazilian state The federative units of Brazil () are subnational entities with a certain degree of autonomy (self-government, self-regulation, and self-collection) and endowed with their own government and constitution, which together form the Federative Repu ...

Rio de Janeiro Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the America ...

. Its population was 46,110 (2022) and its area is 462 km². The city was called Indaiaçu until it was rebaptized in 1925 to homage the poet Casimiro de Abreu, who was born in their coastal district ''Barra de São João''. The municipality contains part of the

Central Rio de Janeiro Atlantic Forest Mosaic The Central Rio de Janeiro Atlantic Forest Mosaic () is a Protected area mosaic (Brazil), protected area mosaic in the state of Rio de Janeiro (state), Rio de Janeiro, Brazil. The mosaic is inland, to the east of the city of Rio de Janeiro. Histor ...

, created in 2006. It holds part of the União Biological Reserve, home to a population of endangered

golden lion tamarin The golden lion tamarin (''Leontopithecus rosalia''; ), less commonly known as the golden lion marmoset, is a small New World monkey of the family Callitrichidae. Endemic to the Atlantic coastal forests of Brazil, the golden lion tamarin is a ...

. It contains of the Macaé de Cima Environmental Protection Area, created in 2001.

References

Populated coastal places in Rio de Janeiro (state) Municipalities in Rio de Janeiro (state) {{RiodeJaneiro-geo-stub