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长江三角洲
维基百科,自由的 encyclopedia
长江三角洲是中国和世界著名河口三角洲之一,也是一个冲积平原。三角洲顶点在江苏仪征附近,由此向东,大致沿扬州、泰州、海安、栟茶一线,是三角洲北界;由顶点向东南,沿大茅山、天目山东麓洪积一冲积扇以迄杭州湾北岸,为其西南界和南界。介于北纬30°20′~32°30′,东经119°24′~122°30′,面积达4万平方千米。大致沿江阴、张家港、常熟、松江、金山一线,分为新三角洲和老三角洲两部分。后者位于西部,系以太湖为中心的冲积、湖积平原,距今7500~6000年前即已成陆;前者系指镇江以东,位于大江两侧的冲积平原和江中沙岛,为距今7000~6000年以来形成的三角洲平原。[1]
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