| River into which the Vltava flows | 33 |
| River island | 12 |
| River island, to Brits | 22 |
| River island: Var. | 18 |
| River islands | 13 |
| River islands, to Brits | 23 |
| River isle | 10 |
| River isles | 11 |
| River islet | 11 |
| River islets | 12 |
| River joining the Fulda | 23 |
| River joining the Missouri near Jefferson City | 46 |
| River Jolson loved | 18 |
| River Jordan's destination | 30 |
| River just south of the Central African Republic | 48 |
| River known anciently as Obringa | 32 |
| River known for disastrous floods | 33 |
| River known for its valley | 26 |
| River known for the goldfields in its basin | 43 |
| River known for water gap | 25 |
| River known in ancient times as Obringa | 39 |
| River known to the ancients as Obringa | 38 |
| River Kwai locale | 17 |
| River land in Scotland | 22 |
| River landing place | 19 |
| River leading to the Caspian | 28 |
| River leading to the Caspian Sea | 32 |
| River leading to the Rhine | 26 |
| River leaper | 12 |
| River lurker | 12 |
| River mammal | 12 |
| River measure | 13 |
| River mentioned in the Rig Veda | 31 |
| River mouth | 11 |
| River mouth area | 16 |
| River mouth areas | 17 |
| River mouth deposits | 20 |
| River mouth feature | 19 |
| River mouth features | 20 |
| River mouth formation | 21 |
| River mouth formations | 22 |
| River mouth phenomenon | 22 |
| River mouth's buildup | 25 |
| River mouth: Abbr. | 18 |
| River mouths | 12 |
| River movement | 14 |
| River name meaning "where the goods are brought in" | 61 |
| River named for an Indian tribe | 31 |
| River near Albertville | 22 |
| River near Anne Hathaway's cottage | 38 |
| River near Balmoral Castle | 26 |
| River near Bologna | 18 |
| River near Chantilly | 20 |
| River near Duke University | 26 |
| River near Dunkerque | 20 |
| River near Eboli | 16 |
| River near Emden | 16 |
| River near Fairbanks | 20 |
| River near Gerona | 17 |
| River near Hadrian's Wall | 29 |
| River near Karachi | 18 |
| River near Kassel | 17 |
| River near Kassel, Germany | 26 |
| River near Khartoum | 19 |
| River near Lethe | 16 |
| River near lots of lovely castles, to the Germans | 49 |
| River near Martigny | 19 |
| River near Milan | 16 |
| River near Mount Ararat | 23 |
| River near Mt. Ararat | 21 |
| River near Nice | 15 |
| River near Nieuwpoort | 21 |
| River near Nottingham | 21 |
| River near Paris | 16 |
| River near Phoenix | 18 |
| River near Siegen, Germany | 26 |
| River near Spoleto | 18 |
| River near St.-Quentin | 22 |
| River near Stonehenge | 21 |
| River near the Bosporus | 23 |
| River near the Great Pyramid | 28 |
| River near the Great Pyramids | 29 |
| River near the Leaning Tower | 28 |
| River near the Louvre | 21 |
| River near the Pyramids | 23 |
| River near the Red Sea | 22 |
| River near the Sorbonne | 23 |
| River near the Sphinx | 21 |
| River near the Uffizi | 21 |
| River near the Vatican | 22 |
| River near Timbuktu | 19 |
| River near Trier | 16 |
| River near Ulm | 14 |
| River near Valence | 18 |
| River near Vicksburg | 20 |
| River near York | 15 |
| River near Zurich | 17 |
| River notably crossed by Caesar | 31 |
| River nymph | 11 |
| River nymph of Greek myth | 25 |