1. Rhine Rhein   Belgrade   Cologne   Montreal   Bern   Hint Half-n-half Clue   2. Nile Nile Blue Nile   Paris   Washington D.C.   Nanking   Cairo   Half-n-half Clue   3. Danube   Washington D.C.   Vienna   Berlin   Nanking   Half-n-half Clue   4. Thames   London   Vienna   Bern   Lisbon   Half-n-half Clue   5. Tagus Tagus Tejo   New York   Lisbon   Rome   Washington D.C.   Half-n-half Clue   6. Zaire (Congo) Zaire Congo   Lisbon   Berlin   Kinshasa   Bern   Half-n-half Clue   7. Aare   Vienna   Bern   Paris   Rome   Half-n-half Clue