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In total there are reported more than one million kilometres of rivers and more than 90 000 km² lakes and 290 000 km² transitional and coastal waters. The total area of reported groundwater bodies is 3.5 million km2. Groundwater bodies have been for different horizon and groundwater bodies may overlay other groundwater bodies.

Table 2.6 lists for the Member States that have reported the number of RBDs, surface water bodies per category; and total and average river lengths and area of lakes, transitional and coastal waters.