England and America to only name two. I would consider looking at a map or an atlas for future reference.
Vietnam
America
England
Austria
A desert county with seven letters includes Algeria.
Out of those letters, I'd try America.
BAHAMAS
Denmark.
There is no such country. There is no country that starts with A and ends with T, let alone a 7-lettered one.
Bahrain Belarus BelgiumBermuda Bolivia Britain Burundi
Ecuador England Estonia Finland Liberia Morocco Namibia Tunisia Uruguay
The country with the letters "newsed" is Sweden.