The flag of Gabon features three horizontal stripes of equal width. The top stripe is green (Pantone 347), the middle stripe is yellow (Pantone 116), and the bottom stripe is blue (Pantone 286). The aspect ratio of the flag is 3:4, meaning its width is 3 units and its height is 4 units. No specific measurements or other geometric properties are prescribed for the flag beyond the proportions and color codes mentioned above.