Mata de São João is a municipality situated in the state of Bahia within the Northeast region of Brazil. The territory covers an area of 605.17 km² (233.66 mi²) and serves as a local administrative center.
The municipality has a population of 47,126 residents, resulting in a population density of approximately 73 inhabitants per square kilometer. It is located roughly 56 km (35 mi) from the state capital, Salvador.