The Paraíba do Sul River is a significant waterway in southeastern Brazil, flowing through the states of São Paulo, Minas Gerais, and Rio de Janeiro. It spans approximately 1,100 kilometers and is an essential source of water for agriculture and urban areas along its banks. The river's basin supports diverse ecosystems and is vital for local wildlife. Historically, the Paraíba do Sul River played a crucial role in the development of the region, facilitating trade and transportation. Its waters are also harnessed for hydroelectric power, contributing to the energy supply in Brazil. The river's health is important for both the environment and the communities that depend on it.