The flag of El Salvador has a horizontal triband design with two outer bands of equal blue color (#0072C6) and a wider central band of white (#FFFFFF). The aspect ratio of the flag is 189:335, and its geometric properties include a rectangle shape with a diagonal stripe dividing it into two right triangles. The measurement of the flag is based on the width of the central white band, which is one and a half times the width of each blue band. There are no other significant elements on the flag.