Tây Thành province

Tây Thành (lit.'Western Fortress') was formerly the 32nd province of Nguyễn Vietnam, encompassing what is now modern-day Cambodia. Its capital was the Cambodian capital of Phnom Penh (known to the Vietnamese as "Nam Vang"). It was a special province with a dual system, consisting of Cambodian monarchs who reigned as puppet rulers while a Vietnamese governor resided in Phnom Penh. The province was finally abolished in 1847 after peace talks between Siam and Vietnam concluded dual-suzerainty over Cambodia.