They are landlocked and do not have the ability to flush themselves out quickly which results in contamination of European sea. and the Mediterranean sea .
The report shows that all four regional seas in Europe have a large-scale contamination problem, ranging from 96 % of the assessed area in the Baltic Sea and 91 % in the Black Sea, to 87 % in the Mediterranean and 75 % in the North-East Atlantic Ocean. The coverage of the assessed area is mostly good but it varies considerably between the four seas and remains limited in the offshore waters of the Mediterranean Sea.
Overall, contamination is declining in all four seas, though the insecticide DDT appears to be at best stabilising in the Mediterranean Sea. The concentrations of some well-known contaminants, such as cadmium and mercury, appear to be declining but in many areas not enough to meet agreed thresholds.
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