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
Coral Sea About 90% of sea contamination originates from land farming activities. The area is continuously urbanising, so that the population is expected to increase by 40% by 2026. As a result, 70–90% of the coastal wetlands has been lost over the past decades, and many remaining flora species are endangered. On 3 April 2010, the Chinese ship "Shen Neng 1" carrying 950 tonnes of oil, ran aground east of Rockhampton in Central Queensland, Australia, causing the 2010 Great Barrier Reef oil spill and inflicting the largest damage to the GBR and the Coral Sea so far. The scarred area was roughly