Which of these countries has the highest mountain?
Portugal
Slovakia
Kosovo
Bulgaria
Musala is the highest peak in the entire Balkan Peninsula, standing at 2,925 m (9,596 ft). The summit of the Rila mountain range in southwestern Bulgaria, Musala is the highest peak between the Alps and the Caucasus and the highest in Eastern Europe bar the Caucasus. With a prominence of 2473 m, Musala is the 7th most prominent mountain peak in Europe.  
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Answers by country
Portugal
Slovakia
Kosovo
Bulgaria
answers
 Estonia
Estonia12
 the United Kingdom
the United Kingdom26
 Germany
Germany67
 Austria
Austria21
 the United States
the United States33
 Greece
Greece15
 Poland
Poland2042
 Australia
Australia11