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 reef of Varadero such as in Varadero, to understand reef resilience. Coral reef of Varadero Coral reef of Varadero is a coral reef located in the Bay of Cartagena, Colombia. Its paradoxical existence, harboring high coral cover and diversity despite the poor water quality and sediments discharged during the last 500 years by the Canal del Dique into the Bay, has drawn special interest by the scientific community and local and international media. The persistence of the Varadero reef is currently threatened by a project to modernize Cartagena’s port, not only by the direct damage produced by the dredging of a new shipping