Tây Thành was formerly the 32nd province of Nguyễn Vietnam, encompassing what is now modern-day Cambodia. Its capital was the Cambodian capital of Phnom Penh. It was a special province with a dual sys
Cambodia and Southern Vietnam in 1860 (the names of the Cambodian districts as named by the Nguyễn dynasty, transliterated from French): Nam Thái (An-tai F), Phù Nam (Phou-Nam), Nam Ninh (Nam-nigne), Lư An (Lou-an), La Kết (La-Kiet), Tầm Vu (Tam-vou), Nam Vang (Nora-Vang), Kỳ Tô (Ki-to), Long Tôn (Long-ton), Ngọc Bi (Ngoc-bai), Ý Dĩ (Yao-dzi), Hải Tây (Hai-tai), Hải Đông (Hai-dong), Bình Xiêm (Bigne-Xien), Phúc Lai (Pheuoc-laḯ), Chấn Tài (Kieng-tai), Biển Hồ (Ho-hai-nhi), Bát Tầm Bang (Bato-an boun).