The Neckar is a river in southwestern Germany, flowing through the states of Baden-Württemberg and Hesse. It is approximately 367 kilometers long and is a tributary of the Rhine River. The Neckar passes through several cities, including Heidelberg and Tübingen, and is known for its picturesque landscapes and historic sites. The river plays an important role in local transportation and commerce, providing a navigable waterway for shipping. The Neckar is also popular for recreational activities such as boating, fishing, and cycling along its scenic banks, attracting both locals and tourists alike.