Rila
The highest summit is Musala at an altitude of 2 , 925 m which makes Rila the sixth highest mountain range in Europe after the Caucasus , the Alps , Sierra Nevada , the Pyrenees and Mount Etna , and the highest one between the Alps and the Caucasus . 
<triplet> Musala <subj> Rila <obj> mountain range <triplet> Rila <subj> Musala <obj> highest point