The Dziwna () is a channel of the Oder River in northwestern Poland, one of three straits connecting the Szczecin Lagoon with the Bay of Pomerania of the Baltic Sea. It separates the island of Wolin from the Polish mainland. The other two channels are the à Âwina and the Peene.
About in length, the Dziwna forms on the eastern end of the Szczecin Lagoon, near the town of Zagórze, Kamieà  County. Flowing north, it passes the town of Wolin and then widens and forms a number of connected features. Towards the west the main channel of the Dziwna forms the large Kamieà Âski Lagoon (Polish: Zalew Kamieà Âski). To the east a side channel develops into the Zatoka Cicha (Quiet Bay, known as Die Maad before 1949), flows north through the strait of Promna as it approaches the city of Kamieà  Pomorski, then rejoins the Kamieà Âski Lagoon. Between these two channels stands the small, largely agricultural island of Chrzàszczewo connected to Kamieà  Pomorski by a single bridge.
The Kamieà Âski Lagoon reforms into the well-defined Zatoka Wrzosowska (Wrzosowska Bay), narrows, then flows past the coastal city of Dziwnów for just a few kilometers as the Dziwna again before finally reaching the Bay of Pomerania.