Castanheiras (Portuguese meaning chestnut) is a municipality located in the Brazilian state of Rondônia. Its population was 2,987 (2020) and its area is 893 km2. See also Castanheira Castanheiro (disambiguation) References External links https://web.archive.org/web/20061202233440/http://www.citybrazil.com.br/ro/castanheiras/ Municipalities in Rondônia