The Uecker (German pronunciation: [ˈʏkɐ]) or Ucker is a river in the northeastern German states of Brandenburg, where it is known as the Ucker, and of Mecklenburg-Vorpommern. Its source lies in the Uckermark district, one kilometer north of Ringenwalde. It flows northward through several lakes. The first one is . The next ones are rather small. In Eggesin, the northern section of the river Randow discharges into the Uecker. In Ueckermünde, the Uecker ends in Szczecin Lagoon, which is connected to the Baltic Sea by the three straits Peenestrom, Świna and Dziwna.