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Switzerland, officially the Swiss Confederation, is a landlocked country located at the convergence of Western, Central Southern Europe. Switzerland's natural landscape is marked by its numerous lakes and mountains, geographically divided among the Swiss Plateau, the Alps, and the Jura.

Located in the Carpathian Mountains, the Slovak Republic shares borders with Austria, the Czech Republic, Hungary, Poland and Ukraine. Water management in Slovakia is determined by its geographic position on the watershed divide between the Black and Baltic Seas. The Danube and its tributaries drain 96% of the country into the Black Sea.

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.