Dongshi is situated on a narrow, north–south oriented plain, flanked by the Dajia River to the west and the Xueshan Range to the east.

The township is bounded by (clockwise from the north) Zhuolan, Heping, Xinshe, Shigang, Fengyuan, Houli, and Sanyi.

[1] Dongshi is divided into 25 villages , which are Beixing, Zhongning, Tungan[vague] , Nanping, Yanping, Shangxin, Guangxing, Taichang, Zhongke, Fulong, Longxing, Xincheng, Yifu, Shangcheng, Xiacheng, Qingdong, Qingfu, Tungxin, Yuening, Xiaxin, Xinglong, Maoxing, Taixing, Beitou and Mingzheng.

Intensive topwork at the start of each season involves grafting Japanese pear bud slips to the tree stock.

Dongshi Forest Park (東勢林場) and Sijiaolin (四角林林場) are managed by the Changhua County and Taichung City Agricultural Committees respectively.