1. coral reefs, coastal and reef-style walls, help protect the coast from erosion caused by waves and currents directly. The coast of coral reef destruction is being severely eroded from the winds in the typhoon season.
1. coral reefs and coastal wall. Help prevent coastal erosion from waves and currents directly. Coastal areas where coral reefs are destroyed, severely eroded by the rough sea in the monsoon season.
1. Coral reefs off the coast of coral reefs and a wall. Help protect the coast from erosion of the wave and current directly. Coast of coral reefs destroyed will be eroded badly from the waves in the monsoon season.