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The TransNational Monitoring Network is an important tool under the Danube River Protection Convention (DRPC), whose Contracting Parties are committed to co-operate in the field of monitoring and assessment. Formally launched in 1996, the TNMN aims to provide a well-balanced overall view of pollution and long-term trends in water quality and pollution loads in the major rivers in the Danube River Basin.

The territory of Bulgaria is 110,912 km². The country is characterized by a rich diversity in morphological, geological, geomorphological, hydro-climatic and soil-biogenic aspects.