崇明島地處長江口，是中國第三大島，被譽為“長江門戶、東海瀛洲”，是世界上最大的河口沖積島，世界上最大的沙島。崇明島成陸已有1300多年曆史，現有面積為1041.21平方公里，海拔3.5米～4.5米。全島地勢平坦，土地肥沃，林木茂盛，物產富饒，是有名的魚米之鄉。崇明島的形成與長江江口的演變相聯在一起。由於長江口有著向東南伸展，且口門沙島有不斷北靠的趨勢。

In Jiangkou of Chongming Island, China's third largest island, known as the "gateway to the Yangtze River, the East China Sea Chou" is the world's largest estuary alluvial island in the world's largest sand island. Chongming Island into land over 1300 years of history, the existing area of ​​1041.21 square kilometers, 3.5 meters to 4.5 meters above sea level.The whole island is flat, fertile land, lush forests and abundant resources, is well-known land of plenty. Chongming Island, the formation and evolution of the Yangtze River estuary linked together. As the Yangtze Delta has extended to the southeast, and the entrance sand island north of the trend continue.

因此，從前的崇明島與現在的位置和形狀相差甚遠。現狀為崇明島東、北方灘地仍在繼續淤漲，其中東灘每年以100餘米的速度向東海推進。 “生態”、“環保”目前是崇明島規劃和建設的主題詞。

Therefore, the former Chongming Island and the location and shape varies significantly. Status quo for the Chongming Island, eastern, northern beaches continues to silt up, where Dongtan annual rate of more than 100 meters, advancing to the East China Sea. "Ecological", "green" are the keywords of the planning and construction of Chongming Island.