The flag of the French Southern and Antarctic Lands features a horizontal tricolor design with three equal bands of blue (#0055A4), white (#FFFFFF), and red (#EF4135). The aspect ratio of the flag is 2:3. In the center of the white band, there is a circle with a diameter of 2/3 the height of the white band. Inside the circle, there is a red square with sides equal to 1/3 the height of the white band. A blue triangle with a base equal to the side of the red square and a height equal to the radius of the circle is inscribed within the red square.