| TICINO | Canton of Switzerland named after a tributary of the Po River (6) |
| ASHIYA | City which is the capital of one of the founding cantons of Switzerland (6) |
| AARGAU | Canton of Switzerland whose capital is Aarau (6) |
| GERS | A department of South West France, named after a tributary of the Garonne (4) |
| RISS | Named after a tributary of the Danube, the third stage of Alpine glaciation (4) |
| DES | Iowa's capital named after a tributary of the Mississippi River, ... Moines |
| MOHAWK | River of New York, a tributary of the Hudson River (6) |
| VLTAVA | The longest river in the Czech Republic, a tributary of the Elbe (6) |
| INDRE | Department in France named after a tributary of the Seine, whose capital is Chateauroux |
| VYATKA | River in Russia, a tributary of the Kama River upon which Kotelnich stands (6) |
| TEVIOT | Scottish Borders river, a tributary of the River Tweed (6) |
| UBANGI | River that is a tributary of the Congo River in central Africa (6) |
| GENEVA | Swiss city, capital of a canton of the same name (6) |
| BLAISE | River in the Haute-Marne and Marne departements of northeastern France that is a tributary of the Marne |
| ELOISE | Ms Mumford is with the Spanish on a tributary of the Seine (6) |
| WABASH | A tributary of the Ohio River that flows across Indiana (6) |
| KANSAS | River that becomes a tributary of the Missouri (6) |
| IRWELL | River in north west England that is a tributary of the Mersey (6) |
| TIGRIS | Asian river, a tributary of the Euphrates (6) |
| GRANTA | A tributary of the River Cam (6) |
