The Itajaí River is located in the state of Santa Catarina, Brazil. It flows approximately 150 kilometers and is known for its importance in local agriculture and fishing. The river's basin supports various ecosystems and is vital for the region's economy. The river originates in the Serra do Tabuleiro mountain range and empties into the Atlantic Ocean near the city of Itajaí. It serves as a natural boundary for several municipalities and is a key waterway for transportation and trade in the area. The Itajaí Port is one of the busiest ports in Brazil, further highlighting the river's significance.