Flag of Gabon — construction sheet
Own work Geometry and dimensions from Law 54/60. The law is quoted (or more likely translated and paraphrased) in a Flag Institute paper: Doubts and certainties in vexillology.

The Gabonese flag consists of three equal bands: an upper band of a clear 'Irish green', of a length equal to four times the height of the first band; a central band of a golden yellow, of the same length; and a lower band of a 'royal blue', of the same length. The green symbolises the equatorial forest; the yellow, the sun; and the blue, the sea.— extract from Law 54/60

The wording is not fully explainable and it may not have been what the government intended, but the outcome is a flag with a 3:4 ratio. See also the discussion at Flags of the World (FOTW).


There is no evidence that anybody actually manufactures flag that complies with the 3:4 ratio.  The government would do well to rewrite and/or clarify its flag law.
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