| Adour, Garonne, Dordogne, Charente and coastal waters |
| Adriatic Sea coastal catchments and small basins |
| Aegean Islands |
| Aegean sea coastal catchments and small basins |
| Aksu |
| Aland islands |
| Algarve Basins |
| Andalusia Atlantic Basins |
| Andalusia Mediterranean Basins |
| Anglian |
| Arbogaan |
| Attica |
| Azov Sea coastal areas and small basins |
| Balearic Islands |
| Barents sea coastal catchments and small basins |
| Basque County internal basins |
| Black Sea Basin District |
| Black sea coastal and small river basins |
| Bornholm |
| Bothnian Sea |
| Buyuk Menderes |
| Carsamba |
| Caspian sea coastal catchments and small basins |
| Cavado, Ave and Leca |
| Central Macedonia |
| Ceyhan |
| Corsica |
| Coruh |
| Crete |
| Crni Drim / Drin,Drini i Zi |
| Cyprus |
| Danube Region Basin District |
| Daugava |
| Dee |
| Dnepr |
| Dniestr |
| Don |
| Douro |
| East Aegean Region Basin District |
| Eastern |
| Eastern Alps |
| Eastern Mediterranean coastal catchments and smal* |
| Eastern Peloponnese |
| Eastern Sterea Ellada |
| Ebro |
| Elbe |
| Ems |
| Endorheic systems |
| Epirus |
| Finnmark |
| Galician Coast |
| Galilea sea |
| Gauja |
| Gediz |
| Glomma |
| Goksu (southern branch) |
| Gran Canaria |
| Guadiana |
| Gulf of Finland coastal catchments and small basins |
| Humber |
| Iceland sea coastal catchments and small basins |
| Icelandic basins |
| Internal Basins of Catalonia |
| Jarft |
| Jordan |
| Jucar |
| Jutland and Funen |
| Kem |
| Kemijoki |
| Kizilirmak |
| Kocacay |
| Kokemäenjoki-Archipelago Sea-Bothnian Sea |
| Kuban |
| Kura |
| Kymijoki-Gulf of Finland |
| Lielupe |
| Loire, Brittany and Vendee coastal waters |
| Lotto / Lutto |
| Luga |
| Madeira |
| Malta |
| Meuse |
| Mezen |
| Middle Appenines |
| Minho and Lima |
| Moere and Romsdal |
| Narva |
| Neagh Bann |
| Nemunas |
| Neretva |
| Neva |
| Nordland |
| North Adriatic |
| North Baltic |
| North Eastern |
| North West |
| North Western |
| Northeast Atlantic Ocean coastal catchments and small basins |
| Northern Appenines |
| Northern Dvina |
| Northern Peloponnese |
| Northumbria |
| Oder |
| Orontes |
| Oulujoki-Iijoki |
| Pivdennyy Buh |
| Po Basin |
| Pregolya |
| Rhine |
| Rhone and Coastal Mediterranean |
| Rioni |
| SE South West |
| Sado and Mira |
| Safid |
| Sakarya |
| Sardinia |
| Scheldt (Brussels Area) |
| Schlei/Trave |
| Scotland |
| Sea of Marmara coastal catchements and small basi* |
| Segura |
| Seine |
| Seman |
| Serchio |
| Severn |
| Seyhan |
| Shannon |
| Sicily |
| Skagerrak and Kattegat |
| Solway Tweed |
| South Baltic |
| South East |
| South Eastern |
| South Western |
| Tagus and Western Basins |
| Talkheh Rud |
| Teno-, Näätämö- and Paatsjoki (Finnish part) |
| Terek |
| Thames |
| Thessalia |
| Tigris |
| Tornionjoki (Finnish part) |
| Troendelag |
| Troms |
| UK South West |
| Unnamed basin, ID W3V0000200 |
| Unnamed basin, ID W3V0000300 |
| Unnamed basin, ID W3V0000400 |
| Unnamed basin, ID W3V0000700 |
| Unnamed basin, ID W3V0001000 |
| Unnamed basin, ID W3V0002200 |
| Unnamed basin, ID W3V0010000 |
| Unnamed basin, ID W3V0010100 |
| Unnamed basin, ID W3V0010300 |
| Unnamed coastal catchments, ID WSS2571000 |
| Unnamed coastal catchments, ID WSS6075000 |
| Unnamed coastal catchments, ID WSS6078000 |
| Unnamed coastal catchments, ID WSS6081000 |
| Unnamed coastal catchments, ID WSS6088000 |
| Unnamed coastal catchments, ID WSS6153000 |
| Unnamed coastal catchments, ID WSS6156000 |
| Unnamed coastal catchments, ID WSS6157000 |
| Unnamed coastal catchments, ID WSS6158000 |
| Unnamed coastal catchments, ID WSS6159000 |
| Unnamed coastal catchments, ID WSS6160000 |
| Unnamed coastal catchments, ID WSS6161000 |
| Unnamed coastal catchments, ID WSS6162000 |
| Unnamed coastal catchments, ID WSS6163000 |
| Unnamed coastal catchments, ID WSS6164000 |
| Unnamed coastal catchments, ID WSS6165000 |
| Unnamed coastal catchments, ID WSS6166000 |
| Unnamed coastal catchments, ID WSS6167000 |
| Unnamed coastal catchments, ID WSS6169000 |
| Unnamed coastal catchments, ID WSS6174000 |
| Unnamed coastal catchments, ID WSS6175000 |
| Unnamed coastal catchments, ID WSS6706000 |
| Unnamed coastal catchments, ID WSS6707000 |
| Unnamed coastal catchments, ID WSS6795000 |
| Unnamed coastal catchments, ID WSS6825000 |
| Ural |
| Venta |
| Vidaa-Krusaa |
| Volga |
| Vouga, Mondego and Lis |
| Warnow/Peene |
| Weser |
| West |
| West Aegean Region Basin District |
| West Bay |
| West Estonia |
| Western |
| Western Macedonia |
| Western Peloponnese |
| Western Sterea Ellada |
| Western Wales |
| White sea coastal catchments and small basins |
| Wisla |
| Yenice |
| Yesil |
| Zarrineh Rud |
| Zealand |
| Zhem |