Municipality in Northeast, Brazil
São João da Fronteira (Portuguese meaning "Saint John of the frontier") is a municipality in the western part of the state of Piauí in Brazil. The population is 6,064 (2020 est.) in an area of 764.86 km².[2] The elevation is 458 m.
The municipality contains part of the 1,592,550 hectares (3,935,300 acres) Serra da Ibiapaba Environmental Protection Area, created in 1996.[3]
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