アバ・チベット族チャン族自治州
Dayi County () is a county of Sichuan Province, China, it is under the administration of the prefecture-level city of Chengdu, the provincial capital. It is Chengdu City's westernmost division, bordering the prefecture-level divisions of Ya'an to the south and the Ngawa Tibetan and Qiang Autonomous Prefecture to the north.