西魏置三岡郡，屬開州。治所在今四川大竹縣北。北周天和四年（569年）改屬通州。轄境相當今四川大竹縣北部地。隋文帝開皇三年（583年）廢三岡郡，轄地歸屬通州。
參考文獻
- 《中國行政區劃通史·十六國北朝卷》
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