海南岛西北部以儋州湾为界,可划分为地质背景截然不同的南北两区,其中北部属玄武岩台地,南部属冲积平原.儋州沿岸是环岛珊瑚礁较为发育的地区之一,该区原生礁块在低潮时大部分出露于海面,且出露高度在不同岸段有较大差异.在南部排浦沿岸,原生死亡滨珊瑚直径1～3m,低潮时出露高度0.2～0.5m,礁体保存较完 The northwestern part of Hainan Island is bounded by Zhuozhou Bay, which can be divided into two regions of north and south with distinct geological backgrounds, basalt in the north and alluvial plain in the south. The coast of Zhuozhou is one of the more developed coral reefs around the island. Most of the reefs were exposed to the sea at low tide, and the height of the outcrops varied greatly among the different shore sections. In the southern bank of the Pangpu, the diameter of the native coral corals was 1 ~ 3m and the height of exposure was 0.2 ~ 0.5m at low tide, Reef preservation more finished