西魏置三冈郡,属开州。治所在今四川大竹县北。北周天和四年(569年)改属通州。辖境相当今四川大竹县北部地。隋文帝开皇三年(583年)废三冈郡,辖地归属通州。
参考文献
- 《中国行政区划通史·十六国北朝卷》
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