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長江三角洲
維基百科,自由的 encyclopedia
長江三角洲是中國和世界著名河口三角洲之一,也是一個沖積平原。三角洲頂點在江蘇儀徵附近,由此向東,大致沿揚州、泰州、海安、栟茶一線,是三角洲北界;由頂點向東南,沿大茅山、天目山東麓洪積一沖積扇以迄杭州灣北岸,為其西南界和南界。介於北緯30°20′~32°30′,東經119°24′~122°30′,面積達4萬平方公里。大致沿江陰、張家港、常熟、松江、金山一線,分為新三角洲和老三角洲兩部分。後者位於西部,系以太湖為中心的沖積、湖積平原,距今7500~6000年前即已成陸;前者係指鎮江以東,位於大江兩側的沖積平原和江中沙島,為距今7000~6000年以來形成的三角洲平原。[1]
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