The Carioca River is a small river located in the city of Rio de Janeiro, Brazil. It flows through the city and is approximately 5 kilometers long. The river is known for its historical significance and has been an important water source for the region since colonial times. The river's course runs through several neighborhoods, including Centro and Glória, before it empties into the Guanabara Bay. Over the years, the Carioca River has faced pollution and environmental challenges, but efforts have been made to restore its natural beauty and improve water quality.