Vũng Tàu is the largest city of Bà Rịa–Vũng Tàu province in southern Vietnam. It is the province's economic, financial and cultural centre, and a popular tourist hub in southern Vietnam. The city area is 140 square kilometres, consists of 13 urban wards and one commune of Long Sơn Island. Vũng Tàu was the capital of the province until it was replaced by the much smaller Bà Rịa city on 2 May 2012. The city is also the crude oil extraction center of Vietnam.

Bà Rịa is a city in Bà Rịa–Vũng Tàu province in the Southeast region of Vietnam. Bà Rịa is split from Vũng Tàu by a river crossed by Cỏ May Bridge. This is the de jure seat of the province since most of the provincial administration agencies are located here. Bà Rịa officially became the provincial capital of Bà Rịa–Vũng Tàu from 2 May 2012, replacing Vũng Tàu in that role.