| Answer | Crossword Clue |
|---|---|
| INN | River, part of Austrian boundary. |
| LYS | River, part of French-Belgian boundary. |
| DEE | River that forms part of the England-Wales boundary |
| EMS | River forming part of the Germany-Netherlands boundary |
| URAL | River forming part of the boundary between Europe and Asia |
| MINO | River forming part of the boundary between Spain and Portugal: Span. |
