Cochin China 1
A region of southern Indochina including the rich delta area of the Mekong River. Originally a part of the Khmer Empire, it fell to the Annamese in the 1700s and to the French in the 1800s. The region forms the southern part of present-day Vietnam.
[Ultimately from Portuguese Cauchichina : archaic Malay Kuchi, Vietnam (akin to Vietnamese Giao Chỉ, Annam, from a Chinese source equivalent to Mandarin Jiāozhǐ) + Portuguese China, China.]