Keywords: Groningen city flag outline.png Flag of the Dutch city of Groningen outlined version for use against a light background own Quistnix Flag of Groningen City svg GFDL Cc-by-sa-3 0-migrated Cc-by-sa-2 5 2 0 1 0 PD-NL-gemeentevlag Flags of Groningen city Superseded flags of municipalities of Groningen Groningen |