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The flag of the Federal Republic of Bengen is a horizontal triband with three stripes of equal height. From top to bottom, the colours are red, turquoise (cyan), and blue. The flag has no coat of arms, emblem, or other charges, making it a plain tricolour.
The tricolour of Bengen traces its origin to the banner of the Principality of Bengen, first raised in 1879, at a time when the national awakening sought a single emblem capable of expressing the country's history and aspirations. Inspired by the ideals of liberty and unity that spread throughout nineteenth-century Europe, the combination of red, turquoise, and blue soon became inseparable from the Bengenese national movement. Although successive Bengenese states adopted different arrangements of the three colours—vertical, horizontal, and with various coats of arms—the colours themselves endured through every constitutional transformation, eventually being enshrined in the flag of the Republic.
Tradition assigns to red the courage, sacrifice, and determination of those who defended the nation's sovereignty; blue symbolizes loyalty, justice, and the enduring stability of the State; while the distinctive turquoise, uncommon among the flags of the world, came to represent the rivers and lakes that have long united Bengen's diverse regions, as well as hope, renewal, and harmony among its peoples. In Bengenese historical thought, the turquoise band serves as a bridge between the red of sacrifice and the blue of peace, expressing the belief that national unity is achieved not merely through strength, but through reconciliation and shared purpose. For this reason, the tricolour is regarded not simply as a state emblem, but as the visual embodiment of the national motto that has guided Bengen since the nineteenth century: that union is the foundation of liberty and the guarantee of the country's future.