Flag of Groningen
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The flag of Groningen was adopted in 1950, and is based upon the coats-of-arms of the City of Groningen and the Ommelanden.
The colours red, white and blue are derived from the coat-of-arms of the Ommelanden, and the white and green comes from the coat-of-arms of the city. The colours of the city are in the centre of the flag to represent the central location of the city.