DREWENZ, a river of Germany, a right-bank tributary of the Vistula. It rises on the plateau of Hohenstein in East Prus sia, 5 m. S.W. of the town of Hohenstein. After passing through the lake of Drewenz (7 m. long), it flows south-west through flat marshy country, and forms, from just below the town of Strass burg to that of Leibitsch, a distance of 3o m., the frontier be tween East Prussia and Poland. After a course of 148 m. it enters the Vistula from the right, a little above the fortress of Thorn.