This information was shared on Koun Banega Karodpati program.
When I heard this piece of information, I was surprised !!!
Question
With which country, France shares its longest border ??
After hearing this question, I imagined map of Europe.
I could name Spain, Italy, Switzerland, Luxembourg, Germany etc.
All of these are comparatively small countries ......
Out of them, France shares longest border with Spain about 623 km !!!
Believe it or not,
France shares its longest border with BRAZIL !!!!
France has an unique situation because it has land both in Europe and South America ......
The longest land border is between French Guiana and Brazil in South American continent !!!
French Guiana is not a mere French colony !!!
It is a full part of France same as Paris ......
So , this region is officially France -- Brazil border !!!
Correct answer : BRAZIL !!!