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Alto Alegre dos Parecis is a municipality located in the Brazilian state of Rondônia. Its population was 13,255 (2020) and its area is 3,958 km².
The municipality contains 20% of the 384,055 hectares (949,020 acres) Corumbiara State Park, created in 1990.
It also contained the 38,950 hectares (96,200 acres) Serra dos Parecis State Park, created in 1990 and cancelled in 2010.