我国大陆海岸线绵长曲折,长达18000多千米,沿海岛屿众多,达5000多个,这些岛屿按其成因可划分为基岩岛、冲积岛和珊瑚岛三大类型。一、基岩岛基岩岛主要沿大陆基岩海岸分布,这类岛屿在辽东半岛、山东半岛的两侧分布很广,如辽东半岛东南侧的长山群岛,它由50多个岛屿组成;山东半岛北岸的庙岛列岛、崆峒 The coastline of China’s mainland is long and winding, with more than 18,000 kilometers. There are more than 5,000 islands along the coast. These islands can be divided into three types: the base rock island, alluvial island and coral island. 1. Bedrock Island Bedrock Island is mainly distributed along the continental rocky coast. These islands are widely distributed on both sides of the Liaodong Peninsula and Shandong Peninsula, such as the Changshan Islands on the southeast side of the Liaodong Peninsula. It consists of more than 50 islands. Miaodao archipelago of the northern shore of Shandong Peninsula