The Cả River (Laotian: Nam Khan, Vietnamese: Sông Cả) or better known as Lam River (sông Lam in Vietnamese) is a river in mainland Southeast Asia.
Etymology
Its name sông Cả ("the first river") in modern-Vietnamese language is originated from Nam-khan ("the big river", Nậm-cắn) in the old-Laotian language. However, it was called usually as sông Rung ("the Krung river") by indigenous people. This word has therefore been signed in Chinese characters as sông Lam or Lam-giang ("the blue river", K'lam, Kẻ Lam of Khả-lam in ancient Annamese language).
^Marine research in Indonesia: Issues 16-20 - Page 229 Lembaga Oceanology Nasional (Indonesia), Lembaga Ilmu Pengetahuan Indonesia - 1976 "The Ca River is the longest river in the central part of Vietnam, the main length belongs to Nghệ An and Hà Tĩnh provinces. This river possesses abundant natural resources and habitats of many valuable plants and animals,"
^Journal of Geology: Issues 9-12 Cục địa chất Việt Nam - 1997 "2. 7. Cả River zone: This zone lies along the Cả River and Rào Nay basins, with a length of 300 km"