The Pregel River is a river located in the Kaliningrad Oblast of Russia. It flows for approximately 123 kilometers and is known for its scenic beauty and historical significance. The river originates from the Masurian Lake District in Poland and eventually empties into the Baltic Sea. The Pregel River has played an important role in the region's development, serving as a vital waterway for trade and transportation. It passes through the city of Kaliningrad, which was formerly known as Königsberg. The river is also popular for recreational activities such as fishing and boating.