In what/which country is Mount Fuji?
ell.stackexchange.com/users/11291/tunny
Don't be afraid to end a sentence with a preposition if that's really the most natural way to construct the sentence.
You could certainly ask, "Where is Mount Fuji?", but if you're specifically wanting to know the country, "What country is Mount Fuji in?" sounds most natural.
ell.stackexchange.com/users/4686/Jolenealaska
Where is Mt. Fuji situated?
In what country is Mt. Fuji situated?
ell.stackexchange.com/users/4159/rogermue
Where is Mt. Fuji?In what country is Mt. Fuji?
"What country can Mount Fuji be found?
" Is missing the word "in."
ell.stackexchange.com/users/11472/M. K. Hunter
In what country can Mount Fuji be found?
As Kim points out, the original question is explicitly asking for a country.
There is no context that implicitly asks for a country, so the question must use the word "country".
If the question were changed to "Where", someone could answer "Honshu" or "Asia" or "Earth", instead of "Japan".
It is usually possible to convert a full-sentence question into a full-sentence answer by changing the word order.
The original post's question can be correctly answered by: Mount Fuji can be found in what country Japan.
Note that the word in needs to be included in the sentence, in order to make the sentence be grammatically correct.
Changing the word order back to that of a question, we get: In what country can Mount Fuji be found?
Because the list of countries is short enough that we could select the correct country from a list, it is also grammatically correct to use "which country" instead of "what country": In which country can Mount Fuji be found?
ell.stackexchange.com/users/9100/Jasper
To all who are using "Where is Mount Fuji?".
This is NOT correct.
Given that we do not know the circumstances given the question we must be authoritative to the original post.
Example: 2 people are examining a distant landscape painting, named "Mount Fuji Landscape".
If the questioner asks "Where is Mount Fuji?" instead of "In which country is Mount Fuji?" or "What country is Mount Fuji in?", then the answer is no longer guaranteed to match the original question.
I.e. The responder could just point to Mount Fuji in the landscape painting and say "There!"
ell.stackexchange.com/users/None/
I want to ask the question:   What country can Mount Fuji be found?   Is there a better way that I can ask this question using correct grammar?
Better way of asking "What country can Mount Fuji be found?"
ell.stackexchange.com
<british-english><questions>
ell.stackexchange.com/questions/37864
ell.stackexchange.com/users/None/
Options include: "In what country can Mount Fuji be found?", "What country is Mount Fuji in?", "In  what/which country is Mount Fuji?", "In what country is Mt. Fuji situated?" or "Where is Mt. Fuji situated?" You can say 'In what/which country is Mt. Fuji situated?'
You can say 'In what/which country is Mt. Fuji situated?'