What is the name of the river that flows through Berlin?

The river that flows through Berlin is called the Spree. It is one of the major rivers in Germany, and it runs through the eastern part of the country. The Spree is approximately 400 kilometers long and flows into the River Havel near Berlin's western boundary.

The Spree is an important waterway, and it has been used for transportation and trade for centuries. In the 19th and early 20th centuries, it was also an important source of energy for Berlin's industry, as numerous water mills were built along the river.

Today, the Spree is a popular spot for leisure activities such as boating, swimming, and fishing. It is also a central feature of Berlin's urban landscape, with several important landmarks and attractions located along its banks, such as the Reichstag building, the Berliner Dom, and the East Side Gallery.