Ahr is a river located in western Germany, flowing through the state of Rhineland-Palatinate. It is approximately 125 kilometers long and is a tributary of the Rhine River. The Ahr is known for its picturesque landscapes, vineyards, and charming towns, making it a popular destination for tourists and outdoor enthusiasts. The river's valley, known as the Ahr Valley, is particularly famous for its wine production, especially Pinot Noir. The region's mild climate and steep slopes provide ideal conditions for grape cultivation. The Ahr also offers various recreational activities, including hiking, cycling, and water sports.