一、自然环境概况 渤海位于中纬度带,深入我国大陆内部,在辽宁、河北、山东、天津三省一市之间,为山东半岛和辽东半岛所环抱。仅东部以渤海海峡与黄海相通。东北—西南纵长300海里,东西向宽约187海里,大陆海岸线长2500多公里,面积为8万多平方公里,平均深度18米,最大深度70米。 First, the natural environment Overview Bohai Sea is located in the mid-latitude zone, in-depth within our continental China, Liaoning, Hebei, Shandong, Tianjin, three provinces and one city for the Shandong Peninsula and the Liaodong Peninsula surrounded. Only east of the Bohai Strait and the Yellow Sea. Northeast - Southwest vertical 300 nautical miles, east-west width of 187 nautical miles, the mainland coastline more than 2,500 kilometers, an area of ​​more than 80,000 square kilometers, with an average depth of 18 meters, the maximum depth of 70 meters.