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Sub-basins are smaller working units within a larger river basin or catchment area. They represent a distinct geographical area that is delineated based on the natural drainage patterns of rivers and their tributaries. Sub-basins are used to facilitate the management and assessment of water resources, allowing for more focused and localized analysis and planning within the broader context of the overall river basin.

Over-exploitation of water resources, water regime modifications, water contamination, and a growing number of flood events – negative effects of which are amplified by climate change – are all issues that require harmonised, integrated actions from management authorities in countries that share river basins.