1. Nanking   Danube   Potomac   Aare   Yangtze Kiang Yangtse Kiang Yangtze Yangtse Chang Jiang   Hint Half-n-half Clue   2. Vienna   Tagus Tagus Tejo   Tiber Tiber Tevere   Danube   Seine   Half-n-half Clue   3. Lisbon   Aare   Danube, Sava Danube Sava   Tagus Tagus Tejo   Yangtze Kiang Yangtse Kiang Yangtze Yangtse Chang Jiang   Half-n-half Clue   4. Berlin   Potomac   Spree   Rhine Rhein   Aare   Half-n-half Clue   5. Montreal   Spree   Ottawa, St. Lawrence Ottawa St. Lawrence Outaouais   Aare   Danube, Sava Danube Sava   Half-n-half Clue   6. Washington D.C.   Zaire (Congo) Zaire Congo   Hudson   Potomac   Danube, Sava Danube Sava   Half-n-half Clue   7. Belgrade   Thames   Seine   Danube, Sava Danube Sava   Aare   Half-n-half Clue