Aalst
Actually Amblève is the French name of Amel, a municipality in the Walloon province of Liège, and part of the German-speaking Community of Belgium. It is also the name of the river passing this town.
There isn't a river running on the border and separating separating France and Belgium, but there are several rivers flowing from France and into Belgium: Yser, Escaut (called Schelde in Belgium), and the Meuse river.
St. Louis is the name of a city and a river. The St. Louis River runs through Wisconsin and Minnesota.
You can spell the city name Antwerp from the letters rtwapne. Antwerp is a city in Belgium.
Lille is situated on the Deûle River, near France's border with Belgium.
Lille
The Yser is a river in the County of Flanders, France. The Yser starts in French Flanders, flows into Belgium and into the North Sea.
None, Antwerp is a part of Belgium (Antwerp is both the name of a province and a city)
Charleroi is the correct spelling for the name of the city in Belgium.
It is a river
Brussels is the capital city in Belgium. Buenos Aires is the capital city in Argentina.
There are likely a number of places known as "River City". Glasgow, Scotland is known as River City. It is the setting of a Scottish soap of the same name.