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North Macedonia, officially the Republic of North Macedonia, is a landlocked country in Southeast Europe. Its terrain is mostly rugged, located between the Šar Mountains and Osogovo, which frame the valley of the Vardar River. Three large lakes - Lake Ohrid, Lake Prespa, and Dojran Lake - lie on the southern borders, bisected by the frontiers with Albania and Greece. Ohrid is considered one of the world's oldest lakes and biotopes.

The Danube begins at the confluence of the Brigach and Breg Rivers in the city of Donaueschingen located in the Black Forest, Baden-Württemberg. The German Danube catchment area covers an area of about 56,200 km²; its share of the total Danube catchment area is approx. 7%. The German Danube basin is bordered by the Rhine basin to the west and the Elbe River basin to the east.

The Danube River is seeing an influx of new non-native species, stemming from the increasing interconnections with various European and global water bodies via canals and other waterways designed to facilitate navigation. It is currently believed that alien species are very likely to become even more significant in the future, as the importance of the Danube as an international waterway increases.