Cửu Long was a province in the Mekong Delta region of southern Vietnam. It was created in 1976 from the merger of Vinh Long Province and Vinh Binh Province. In 1992 Cuu Long was re-split into Vinh Long and Tra Vinh provinces.
In Vietnamese, Cửu Long (deriving from the Sino-Vietnamese 九龍) literally means "nine dragons." The area of Hong Kong called Kowloon shares a common etymology.