Acropora hyacinthus is a coral that forms large, low, roughly circular tables or semi-circular brackets. It has a fairly variable form, mostly due to its very wide range of habitats. In turbulent water it forms solid, heavy sheets with stunted vertical branchlets (it is found in very rough water), and in sheltered conditions its branchlets become longer, slender and more separate. This species is one of the most abundant corals of exposed outer reef slopes of much of the western Pacific. It was found at six of six regions in Indonesia. Found at 40 sites of 87 sites surveyed in the Marshall Islands.