Thủ Dầu Một is a former city situated in the Southeast region of Vietnam. It served as the capital city of the former Bình Dương province and is located at approximately 10°58′0″N 106°39′0″E.
The city occupied an area of 118.91 km² and had a population of 373,105. Geographically, it is positioned on the left bank of the Saigon River, situated upstream from the city of Thủ Dầu Một.