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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.

Albania, officially the Republic of Albania, is a country in Southeastern Europe. The country is located in the Balkans on the Adriatic and Ionian Seas within the Mediterranean Sea. Albania has a variety of climatic, geological, hydrological, and morphological conditions. Albania boasts a significant diversity, with the landscape ranging from the snow-capped mountains in the Albanian Alps and the Korab, Skanderbeg, Pindus, and Ceraunian Mountains, to the hot and sunny Albanian Adriatic and Ionian Sea Coasts.

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.