This is the 56th most frequent Slovenian word.
slovenije
"Slovenije" means "of Slovenia" (possessive form).
Here, 'Slovenije' represents the possessive form (genitive case) of 'Slovenia', indicating that Ljubljana belongs to Slovenia.
Ljubljana je glavno mesto Slovenije.
Ljubljana is the capital city of Slovenia.
In this sentence, 'Slovenije' is used in the genitive case to indicate possession—specifically, the map that pertains to Slovenia.
Zemljevid Slovenije je zelo podroben.
The map of Slovenia is very detailed.
Here, 'Slovenije' in the genitive case marks the place of origin, indicating that the musicians are from Slovenia.