Chiayi County is located west of Yushan, east of the Taiwan Strait, north of Tainan County, and south of Yunlin County. The administration of Chiayi is divided into two cities, two urban townships, and fourteen rural townships. They are Pozi City, Taibao City, Dalin Township, Budai Township, Zhongpu Township, Zhuqi Township, Meishan Township, Yizhu Township, Minxiong Township, Dongshi Township, Lucao Township, Liujiao Township, Fanlu Township, Shuishang Township, Alishan Township, Dapu Township, Xingang Township, and Xikou Township.
Yizhu is located at the southwest of Chiayi County. It connects with Lucao Township to the east, Pozi City in the northeast, Budai Township in the northwest, and Yenshui Township of Tainan County in the south with the Bazhang River as the border. Yizhu contains 22 villages. The total measurement area is 79.2925 km2 while the farming area is about 46.6341 km2, and the urban planning area is 1.615 km2.
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