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The investigation of the Tisza River was a follow-up project of the Joint Danube Survey 2001 organised by the ICPDR. The objective of the survey was to investigate the water quality along the river and to promote public awareness. The countries participating at the survey include Romania, Slovakia, Hungary, and Serbia and Montenegro.

Hungary as a landlocked country is situated within the heart of the Danube Basin. The entire territory (93,030 km2) is found in the Basin. Rivers enter the country from the west, north and east and flow towards the south. Almost one fifth of the 9,8 million inhabitants live in the capital, Budapest - the City of Spas – which lies on the banks of the Danube. Lake Balaton in the west, the largest lake of the Danube Basin, is a recreational area for the country. Hungary became a Signatory Party to the Danube River Protection Convention (DRPC) in 1994 and joined the EU in 2004.

With a national territory of 87,609 km2, Croatia is at the intersection of the Pannonian Plain, the Balkans and the Adriatic. The country straddles the border of two major catchment areas: the Danube Basin and the Adriatic Sea. Draining over 62% of Croatia’s mainland, the Danube Basin covers the northern and central inland section of the country and is home to 69% of the population. Croatian territory accounts for 4.4% of the entire Danube Basin.

The waters of Bosnia and Herzegovina are split between the Danube River Basin District and the Adriatic Sea Basin. Some 40.2% of the Sava river sub-basin, the second largest sub-basin of the Danube River Basin, lies in Bosnia and Herzegovina. The rest of the watershed is shared by Croatia, Serbia and Slovenia.

As both the largest remaining natural wetland and second largest river delta in Europe, the Danube Delta is one of the continent's most valuable habitats for wetland wildlife. Pollution and discharge manipulation from upstream has a huge effect on this area of high biodiversity, plus the delta continues to change ecologically itself – the Danube Delta spreads seaward at a rate of 10 to 25 metres every year.

The Sava is the Danube's largest tributary of the Danube in terms of discharge and the second largest in terms of catchment area. The Sava is shared by Slovenia, Croatia, Bosnia and Herzegovina, Serbia and Montenegro. The joint management arrangements acted as a pilot for the implementation of the European Union's Water Framework Directive for the Danube and Europe.

Covering an area of 157,186 km², the Tisza River Basin is the largest sub-basin of the Danube River Basin. The Tisza River is the longest tributary of the Danube (966 km), and second largest in terms of flow after the Sava. The countries of the Tisza Basin (Ukraine, Romania, Hungary, Slovakia, Serbia) agreed to close transboundary co-operation, aiming to achieve integrated water resources management of the Basin.