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