Ahead of the annual Danube Day, experts and environmentalists are drawing attention to the large-scale environmental threats facing Europe’s largest river system. Over the past 150 years, the Danube has lost about 80% of its natural floodplains and wetlands due to human intervention, dam construction, hydropower, active shipping, and river regulation. This has led to a sharp decline in biodiversity, the disappearance of sturgeon fish, and a weakening of the ecosystems’ ability to withstand floods and droughts.
The total length of the Danube is approximately 2,857 km. It is the most international river in Europe, flowing through or serving as the border of ten countries.
In Germany — about 214 km,
in Austria — 294 km,
in Slovakia — 166 km,
in Hungary — 334 km,
in Croatia — 129 km,
in Serbia — 269 km,
in Bulgaria — 148 km,
in Romania — 825 km,
in Moldova — 49 km,
in Ukraine — about 109 km.
Approximately 83 million people live in the river basin, more than 20 million of whom depend on the Danube as a source of drinking water. The capitals of four European countries are located along the Danube: Vienna, Bratislava, Budapest, and Belgrade.
Among the most serious problems are:
pollution with organic and toxic substances coming from sewage and agricultural land;
clogging with household waste, including plastic;
climate change and water level fluctuations;
invasive species;
construction of dams and hydroelectric power plants that interfere with fish migration;
poaching of sturgeon for black caviar.
Hydraulic structures such as the Iron Gate dam on the border between Serbia and Romania have completely blocked the path to spawning grounds for dozens of fish species.
The WWF Living Danube Partnership initiative has already restored more than 1,700 hectares of wetlands and improved water supply over an area of 3,700 hectares.
The LIFE-Boat 4 Sturgeon project is working to conserve sturgeon, create a genetic bank, and restore populations.
Rational water use systems are being developed, water purification filters are being introduced, and sustainable land use is being implemented.
Companies operating in the Danube basin are being held accountable for water resources.
The Danube remains a vital river for tens of millions of people and the last refuge for unique species of fish and birds. The conservation and restoration of the Danube requires international coordination, a systematic approach to nature conservation, and conscious policies on the part of the countries in the region. The river that Strauss wrote about in his famous waltz “On the Beautiful Blue Danube” must retain its natural character in the 21st century.
