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