| River to the Snake | 18 |
| River to the Severn | 19 |
| River to the Seine | 18 |
| River to the sea, in French | 27 |
| River to the Sea of Okhotsk | 27 |
| River to the Rybinsk Reservoir | 30 |
| River to the Rio Grande | 23 |
| River to the Rhone | 18 |
| River to the Rhine | 18 |
| River to the Rhein | 18 |
| River to the Raba | 17 |
| River to the Ouse | 17 |
| River to the Oise | 17 |
| River to the Ohio | 17 |
| River to the Oder | 17 |
| River to the North Sea | 22 |
| River to the Moselle | 20 |
| River to the Mosel | 18 |
| River to the Moray Firth | 24 |
| River to the Missouri | 21 |
| River to the Mississippi | 24 |
| River to the Mediterranean | 26 |
| River to the Maas | 17 |
| River to the Ligurian Sea | 25 |
| River to the Laptev Sea | 23 |
| River to the Kura | 17 |
| River to the Irish Sea | 22 |
| River to the Indus | 18 |
| River to the Indian Ocean | 25 |
| River to the Humber estuary | 27 |
| River to the Humber | 19 |
| River to the Gulf of Mexico | 27 |
| River to the Gulf of Guinea | 27 |
| River to the Gulf of Finland | 28 |
| River to the Gulf of Cambay | 27 |
| River to the Garonne | 20 |
| River to the Fulda | 18 |
| River to the Firth of Clyde | 27 |
| River to the English Channel | 28 |
| River to the Elbe | 17 |
| River to the Dnieper | 20 |
| River to the Danube | 19 |
| River to the Congo | 18 |
| River to the Columbia | 21 |
| River to the Colorado | 21 |
| River to the Chesapeake Bay | 27 |
| River to the Channel | 20 |
| River to the Caspian Sea | 24 |
| River to the Caspian | 20 |
| River to the Black Sea | 22 |
| River to the Bering Sea | 23 |
| River to the Bay of Biscay | 26 |
| River to the Bay of Bengal | 26 |
| River to the Baltic Sea | 23 |
| River to the Baltic | 19 |
| River to the Azov | 17 |
| River to the Atlantic | 21 |
| River to the Arctic Ocean | 25 |
| River to the Arctic | 19 |
| River to the Arabian Sea | 24 |
| River to the Amazon | 19 |
| River to the Aegean | 19 |
| River to the Adriatic Sea | 25 |
| River to the Adriatic | 21 |
| River to the Aare | 17 |
| River to Tarragona | 18 |
| River to Solway Firth | 21 |
| River to Siegen, Germany | 24 |
| River to Severn | 15 |
| River to Seine | 14 |
| River to Rio Grande | 19 |
| River to Rhone | 14 |
| River to Rhine | 14 |
| River to Pamlico Sound | 22 |
| River to Oder | 13 |
| River to North Sea | 18 |
| River to Moselle | 16 |
| River to Moray Firth | 20 |
| River to Mediterranean | 22 |
| River to Medit. | 15 |
| River to Lyon | 13 |
| River to Liverpool Bay | 22 |
| River to Leeds | 14 |
| River to Lake Ontario | 21 |
| River to Lake Huron | 19 |
| River to Lake Chad | 18 |
| River to Korea Bay | 18 |
| River to Khartoum | 17 |
| River to Kassel, Germany | 24 |
| River to Isar | 13 |
| River to Irish Sea | 18 |
| River to Hecate Strait | 22 |
| River to Hades | 14 |
| River to Gulf of Guinea | 23 |
| River to Gulf of Finland | 24 |
| River to Gorki | 14 |
| River to English Channel | 24 |
| River to Elbe | 13 |
| River to Donegal Bay | 20 |
| River to Danube | 15 |