For the sake of maintaining uniformity in buoyage system worldwide, IALA divided the world into two regions – Region A and Region B.
Region A includes Europe, Australia, New Zealand, Africa, the Gulf and some Asian countries. Region B comprises of North, South, Central America, Japan, Korea, and the Philippines.
While the colour, shape, top marks, light and the rhythm of light identify a buoy / mark, the physical structure can vary greatly. Check out some interesting examples below.