The Marne River is a significant waterway in northeastern France, flowing approximately 525 kilometers (326 miles) from its source in the Langres Plateau to its confluence with the Seine River near Paris. It traverses several regions, including Champagne-Ardenne, and is known for its picturesque landscapes and historical importance. Historically, the Marne River played a crucial role during both World Wars, particularly in the First Battle of the Marne in 1914, which marked a turning point in the war. Today, the river is also popular for recreational activities such as boating and fishing, attracting both locals and tourists.