Flag of Macedonia (Greece)
The flag of Macedonia (Greek: Σημαία της Μακεδονίας) displays a Vergina Sun with 16 rays in the centre of a blue field. This flag, as well as the Vergina Sun, is commonly used as an unofficial symbol of the Greek region of Macedonia and its subdivisions.
Source: Wikipedia — Flag of Macedonia (Greece) (CC BY-SA 4.0)