Extruding into the sea£¬the cliffs have been cut steep by mighty waves and storms down the ages£®Seething waves breaking upon the reefs can rise up to seven meters high£®In the reserve area are also sea caves£¬sea pillars and other marine¡ªcut landforms£®as well as the red continental sedimentary bedrock at nearby Liukuan9£¬all highly valued by Chinese and overseas geologists£®Chengshantou¡¯s zigzag coastline£¬its many bays and headlands£¬and abundant plankton food£¬attracts flocks of swans and other rare birds to go over winter here£®It has become one of the world¡¯s four major swan habitats£®