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The River Oder originates in the low mountain range Oderské Vrchy (Oder Mountains) in the Czech Republic and flows into the Zalew Szczeciński (Szczecin Lagoon) on Polish territory after 855 km. The international river basin district Oder also includes the entire catchment area of ​​the Szczecin Lagoon, the Świna (Swine) flowing from the lagoon to the Baltic Sea as well as the eastern part of the island Usedom and the west of the island Wolin. The river basin district covers an area of 124 049 sq. km. By far the largest share of this catchment area (86 %) is situated in the Republic of Poland, 6 % in the Czech Republic and 8 % in the Federal Republic of Germany. The majority of the German area within the Oder river basin district belongs to Brandenburg, further shares are in Mecklenburg-Western Pomerania and Saxony.
Significant tributaries of the Oder on the left side are Nysa Kłodzka, Kaczawa, Bóbr and Lausitzer Neisse (Nysa Łużycka) and on the right side Kłodnica, Mała Panew, Bartsch and most notable the Warta (Warthe), which makes up about half of the entire Oder catchment area.
The river course of the Oder is divided into the upper Oder (source to the mouth of the Nysa Kłodzka (Glatzer Neiße)), middle Oder (to the mouth of the Warta (Warthe)) and lower Oder (to the mouth of the Szczecin Lagoon (Zalew Szczeciński)).[1][2]

The Coordinated River Basin Unit Oder and - with the participation of Germany - the following international or bilateral commissions / working groups are committed to water protection and flood risk management of the Oder and its tributaries:

• ICPO - International Commission for the Protection of the Odra River against Pollution
• German - Polish Commission on Border Rivers