It has an area of 57 square kilometers, with the most well-known reference points being the lower Kaoping River to the west and Pingtung City to the north. Before the arrival of Han Chinese, plains aborigines of the Siraya tribe lived here.
萬丹鄉位於屏東平原南部，西臨高屏溪，北邊緊接屏東市，早期是西拉雅平埔族的居住地，面積約五十七平方公里。