The flag of Guam has an aspect ratio of 22:41. It features a red border (Pantone 186 C) with a width of 1/16th the length of the flag, surrounding a field of dark blue (Pantone 286 C). In the center, there is an elliptical shape with a long axis of 12 units and a short axis of 4 units, containing a detailed illustration of Guam's coastline in light brown (Pantone 465 C) and a river in dark brown (Pantone 4625 C). Above the ellipse, there is a white band with the word "GUAM" written in red (Pantone 186 C).