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The Danube River flows into the Black Sea at the Danube Delta, making the Black Sea the receiving sea for the Danube's water. A receiving sea refers to the body of water into which a river or other watercourse empties its flow. In this context, the Black Sea serves as the final destination for the waters of the Danube River.

Three sub-basins of the Danube are partly located in Ukraine - the Tisza, Prut and Siret basins, as well as part of the Danube Delta. Furthermore, 2.7 million people live in the Ukrainian part of the Danube Basin, which is 3.3% of the total Danube Basin District. Ukraine has been a Signatory State to the Danube River Protection Convention since 1994. The Convention was ratified by the Ukrainian Parliament in 2002.

As both the largest remaining natural wetland and second largest river delta in Europe, the Danube Delta is one of the continent's most valuable habitats for wetland wildlife. Pollution and discharge manipulation from upstream has a huge effect on this area of high biodiversity, plus the delta continues to change ecologically itself – the Danube Delta spreads seaward at a rate of 10 to 25 metres every year.

Covering an area of 157,186 km², the Tisza River Basin is the largest sub-basin of the Danube River Basin. The Tisza River is the longest tributary of the Danube (966 km), and second largest in terms of flow after the Sava. The countries of the Tisza Basin (Ukraine, Romania, Hungary, Slovakia, Serbia) agreed to close transboundary co-operation, aiming to achieve integrated water resources management of the Basin.

The Black Sea Commission is an intergovernmental organisation responsible for the implementation of the Convention on the Protection of the Black Sea against Pollution, and sets the legal framework required for regional cooperation and the activities necessary to reduce pollution and enhance the protection of the marine environment.