The Rheinufer Tunnel is a road tunnel in Düsseldorf, Germany. The tunnel is part of the B1 German federal road. At 2km long, it is the sixth longest inner city tunnel in Europe.The tunnel runs under the Rhine Promenade near the right hand bank of Rhine. The impressive southern entrance of the tunnel is marked by a tall building, the Düsseldorf Stadttor . The northern entrance is just south of the Oberkassel Bridge.