A dark blue background with a thin red border and the Seal of Guam in the center.
The flag of the United States territory of Guam was adopted on February 9, 1948. The territorial flag is dark blue with a narrow red border on all sides (border was a later addition). Narrow red border represents the blood that it ravaged in World War 2 and Spanish sovereignty. In the center of the flag is the coat of arms; an almond shaped emblem, which depicts a proa sailing in Agana Bay near Hagåtña, and GUAM colored in red letters. The shape of the emblem recalls the slingshot stones used by the islanders' ancestors. The landform at the back depicts the Punta Dos Amantes cliff on Guam.Charles Alan Pownall approved the flag's shape in 1948.
As a complement to the Guam flag design, and in response to Guam law providing for municipal flags, efforts were made to depict the culture of each Guam municipality on their own flag. These efforts to design 19 unique municipal flags were collaborated through the Mayors' Council with the assistance of illustrative artist Gerard Aflague, a Guam born native. These municipal flag designs reflect unique aspects of each of Guam's municipal villages.
The length of the flag is forty inches and the width is seventy-eight inches. Around each side of the flag, there is a two-inch red border. The coat of arms in the center is twenty-four inches tall and sixteen inches wide.