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16% of transitional water bodies in the Celtic Seas to the Iberian Coast are influenced by significant diffuse sources, reported in 5-40% of waters by Spain, France and UK. In the latter three countries, the proportion of water bodies impacted by nutrient enrichment is also on the same order (10-20 %). 35% of the transitional water bodies in the region are affected by significant point sources. These are reported in 30-50% of waters from Spain and UK and in an outstanding 90 % of transitional water bodies in France. The largest proportion of water bodies subject to organic enrichment is reported in the Celtic Seas to the Iberian Coast (31%), mainly by France (90 %) and to a lower extent by UK (35 %). The high proportion of point sources in French transitional water bodies correlate well with the equally high number of water bodies impacted by organic enrichment (Fig. 4.20. b).