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