2025Danube Day - 200th anniversary of the birth of Johann Strauss II - First Day Cover

Danube Day was established on 29 June 1994, when the Convention on Cooperation for the Protection and Sustainable Use of the Danube River was signed in Sofia. This, the second longest river in Europe, with a flow of approximately 2,850 km from its source in the Black Forest Mountains in Germany to its drainage basin in the Black Sea in Romania and Ukraine, forms the most diverse ecosystems and a wealth of biodiversity, the preservation of which is the focus of Danube Day.