German plates, for example, have first letters as city/town designation. 1, 2 or 3 letters. 1 letter is for largest cities, one exception is, HH, for Hamburg (Hansastadt Hamburg), because Hanover has H. The German Plate pictured above is a Hamburg Plate. Some non EU country also use the EU plate format. The vertical blue bar to the left has the country code in it. F is France, D is Germany, for example.
French always used to be first 2 (I think) numbers designating the city/region. 75 is Paris. Now random letters as you rpic shows.
My guess, from the architecture/flora is that this is a Balkan country. Peugeot is sold everywhere, pretty popular, has no relevance. Could be southern France, but doesn't seem right, to me.