The flag of Western Sahara features a black, white, and green horizontal tricolor with a red, upward-facing triangle on the left side. The width-to-length ratio is 2:3, and the total dimensions are 1.5 times as long as they are wide. The red triangle's height is equal to the flag's height and one-third of its width. The exact color codes for the flag are:

• Black: #000000
• White: #FFFFFF
• Green: #008000
• Red: #FF0000

The flag has no official geometric properties or measurements beyond the aforementioned length and width ratio.