The Six Provinces of Southern Vietnam is a historical name for the region of Southern Vietnam, which is referred to in French as Basse-Cochinchine. The region was politically defined and established a
Southern Vietnam during the Nguyễn dynasty before 1841. Cần Vột (Kampot), Vũng Thơm (Kampong Saom) and Svay Rieng (triangular wedge protruding into Vietnam known as the "Parrot's Beak") would later be ceded by French colonials to Cambodia. Cao Mien = Cambodia. Biển Đông = vi: East Sea. Nam Vang = Phnom Penh. Koh Kong was annexed by Siam until being returned to French Cambodia.
French Cochinchina (Basse Cochinchine Française) in 1881, based on the Nguyễn dynasty's Six Provinces before 1861. The northern bank of Vĩnh Tế Canal and the Parrot's Beak of Svay Rieng were ceded to the Cambodian Kingdom.
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).