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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.

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.

Organic pollution has been on the rise in the Danube over the last century, as human activities have resulted in increasing loads of wastewater rich in organic matter. The most serious organic pollution problems occur in tributaries that regularly receive untreated or inadequately treated wastewater from industrial plants and municipalities. Thanks to the significant improvement of wastewater infrastructure and services in the Danube countries, the basin-wide organic emissions reduced by 60% since the mid 2000s.