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The flag of Wallonia is a sub-national flag in Belgium that represents the Walloon Region and French Community. Designed in 1913, the flag depicts a red rooster, commonly known as the bold rooster (French: coq hardi) or Walloon rooster (Walloon: cok walon), on a yellow field. The red and yellow coloring is historically associated with the city of Liège. The flag's association with Wallonia also mean that it is commonly used by the Walloon Movement.

Source: Wikipedia