The Flag of Derhaland is the official flag of Derhaland. The current flag, known as the Trico-Derho, has held its position as the official civil flag of Derhaland since March 1971. A modification of that flag with navy blue stripes is used in times of war or mourning, and also in use for provinces. The current flag of Derhaland can be traced to a base on Ireland's flag, but the old flag in use before 1971 was unique as the only flag to have two counterchanged disks.