The Rio Tietê is a major river in the state of São Paulo, Brazil. It stretches approximately 1,100 kilometers and flows through several municipalities, including the city of São Paulo. The river is an important waterway for transportation and irrigation in the region. Historically, the Rio Tietê has faced significant pollution challenges due to industrial waste and urban runoff. Efforts have been made to clean and restore the river, aiming to improve water quality and enhance the surrounding environment. The river is also a vital resource for local ecosystems and communities.