What is an Elbe tributary?

An Elbe tributary is a river or stream that flows into the Elbe River. The Elbe River is a major river in Central Europe that flows through the Czech Republic, Germany, and Denmark. It is the second-longest river in Germany, after the Rhine. The Elbe River has many tributaries, including the Vltava River, the Saale River, the Havel River, and the Spree River.