The Rhine (French: le Rhin, German: der Rhein)
The southern part of the French-German border follows the river Rhine. The northern part does not follow any river.
Oder River
Gaul was not a who. It was a geographical area. It was the name the Romans gave to an area which covered present day France, Belgium, Holland south of the river Rhine and Germany west of the same river.
Western Front
the vichy line
The Rhine River flows through six countries. These countries are Switzerland, Liechtenstein, Austria, Germany, France and the Netherlands. The river ends at the North Sea.
The River Rhine.
MISSISSIPPI
This seems to be from a crossword+word search. It is Western Front.
Versailles
Vichy France.
Think it is the Seine River
The province between Spain and Germany is Gaul. This province was later overtaken by a barbaric tribe called the Franks. This is where we get the name of the modern country, France.