East of Island #3. Located 0.6mile/1km east of Island #3 and running southeast to northwest the huge, submerged boulders of Boulder City drop down to depths of more than 40m/131ft, rising up to 12m/39ft at their shallowest point. Oriental sweetlips and bluelined snapper congregate amongst the colonies of red and white whip coral that paint the sandy valleys between scattered piles of gigantic boulders. In between the large cracks and crevices an abundance of algae growth provides a rich grazing ground for nudibranchs and flatworms. Rocky outcroppings covered in encrusting corals, gorgonians and sponges play host to a myriad of unicornfish, butterflyfish and angelfish.
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