Apo Reef two lagoon systems, the north and south lagoons which are bounded by narrow reef platforms. It is a almost triangular northern and southern atoll-like reefs separated by a deep channel that is open to the west. The channel runs east to west from deep with a fine white sand bottom, numerous mounds and patches of branching corals under the deep blue water. The north lagoon is an enclosed triangular coral reef platform partly exposed during low tide. It is relatively shallow with depths of about . While the south lagoon is an inverted triangular coral platform enclosed on two sides
Deep-water coral off Africa’s west coast. In addition to ocean bottoms, scientists find "Lophelia" colonies on North Sea oil installations, although oil and gas production may introduce noxious substances into the local environment. The world's largest known deep-water "Lophelia" coral complex is the Røst Reef. It lies between deep, west of Røst island in the Lofoten archipelago, in Norway, inside the Arctic Circle. Discovered during a routine survey in May 2002, the reef is still largely intact. It is approximately long by wide. Some further south is the Sula Reef, located on the Sula Ridge, west of Trondheim on the mid-Norwegian Shelf,