Aru-îá

Arujá lies in the Alto Tietê country northeast of São Paulo, at the edge of the Serra do Mar watershed. Small streams, wooded hills and marshy valley bottoms surround the town. Its name comes from the Arujá stream, a Tupi expression commonly interpreted as “abundance of arus.”

The region was crossed by Indigenous Tupi and Guarani peoples and later by Paulista expeditions following the Paraíba do Sul valley. Colonial roads connected São Paulo with the interior and with routes toward Rio de Janeiro. Farms and ranches occupied the better-drained ground, while wetland and forest supplied game, fish and timber. Settlement remained dispersed around chapels, crossroads and mills rather than forming a large town.

Arujá’s position at the edge of the São Paulo basin made it a passage between the plateau and the valleys below. The Tupi name, small river and forested watershed remained the strongest features of a place that grew slowly from rural parishes and estates.