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The flag of Brandenburg is a horizontal bi-color of red over white, with the arms of the state (land), in the center. The coat of arms of the state shows on a shield in white (silver) a red eagle, looking to the right, with wings decorated with trefoils in gold and armored gold. In its current form, the flag was adopted on 20 January 1991, with further enshrinement in Article 4 of the Constitution of the State of Brandenburg.

Source: Wikipedia