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Poland, officially the Republic of Poland, is a country in Central Europe. Poland has a temperate transitional climate, and its territory traverses the Central European Plain, extending from the Baltic Sea in the north to Sudeten and Carpathian Mountains in the south.

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 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.