Bertioga is a Brazilian municipality located in the state of São Paulo. It serves as part of the Baixada Santista Metropolitan Region and covers a total area of 490.15 km2. The city has a recorded population of 64,723 residents.
The region is characterized by significant geographical diversity and seasonal demographic shifts. While parts of the municipality are densely forested and remain unpopulated, other areas neighbor popular resort towns. Consequently, the local population fluctuates greatly depending on the time of year and tourism seasons.