What is bigger of the two rhine danube and elbe?

The Rhine-Danube waterway is generally considered bigger in terms of its significance and scale, as it connects major European rivers and facilitates extensive trade and transportation across multiple countries. While the Elbe River is important, particularly in Germany, the Rhine-Danube route encompasses a larger network and serves as a crucial artery for commerce in Central and Eastern Europe. Additionally, the Rhine and Danube rivers themselves are among the longest and most significant rivers in Europe.