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三江平原位于我国东北端,是由黑龙江、松花江、乌苏里江和兴凯湖冲积而成的低平原,总面积约51300平方公里。由于平原内部地势平坦,地面坡降小,土质粘重、渗透困难,沼泽土壤广泛发育,是我国沼泽土壤集中分布的地区之一。沼泽土壤主要分布在浓江、别拉洪河、挠力河、七星河、阿布沁河、七虎林河、穆棱河、松阿查河的河漫滩及阶地上的低洼地,水城子古河道,以及大小兴凯湖湖滨。面积13700余平方公里。
Sanjiang Plain is located in the northeast end of China, is a low plain formed by the Heilongjiang, Songhua River, Wusuli River and Xingkai Lake alluvial, with a total area of about 51300 square kilometers. Due to the flat terrain inside the plain, the small slope of the ground, the heavy clay, and the infiltration difficulty, the swamp soil develops widely and is one of the concentrated distribution areas of swamp soil in China. The swamp soil is mainly distributed in the thick rivers, the Belajang River, the Naoli River, the Qixing River, the Abu Qin River, the Seven Hulin River, the Muling River, the loose river on the Song Acha River and the low-lying land on the terrace, , And the size of Xingkai Lake shore. An area of 13,700 square kilometers.