a river in northern Poland, a right tributary of the Vistula. Its length is 252 km, and it drains a basin of 5,500 sq km. It rises in the Masurian Lake region and flows through a forested plain. The average flow of water is 26 cu m per sec. Timber is floated on the Drwęca, and its lower course is navigable. The upper reaches of the Drwęca are linked with the Gulf of GdaĔsk by the Elbląg-Ostroda Canal. The city of Brodnica is on the Drwęca.