南梁大同二年（536年）分宣汉县置万州，下辖新安郡，治三冈县（今四川省达州市达川区南平滩）。西魏废帝二年（553年）西魏占领新安郡，改为新宁郡。隋文帝开皇三年（583年）废新宁郡，三冈县归通州。
参考文献
- 《中国行政区划通史·三国两晋南朝卷》
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