The flag of South Sudan consists of three equal horizontal stripes - the top and bottom stripes are black, while the middle stripe is red. Centered on the red stripe is a white five-pointed star bordered by a thin blue circle. The aspect ratio of the flag is 1:2. The color codes for the flag are:

• Black: #000000
• Red: #CE1126
• White: #FFFFFF
• Blue: #0072C6

There are no specific geometric properties or measurements mentioned in the official description of the flag.