The word Lam is spelled to the Rung (ຮຸ່ງ) in the Lao language what means bright. Old Vietnamese idioms have the Sông Rung rú Hống (Rung river and Hong mountain) and Sông Lam rọi núi Hồng (Blue river lights up Red mountain).
Beside, word Cả means first what insinuated the importance of Lam river.
It originates in the Loi Mountains of Laos, crossing Laos's Xiangkhouang Province, Vietnam's Nghệ An and Hà Tĩnh provinces and empties into the Gulf of Tonkin, on the North Central Coast of Vietnam, after a 512 km journey. The Cả River zone is classified as 300 km by the Vietnam Geographical Survey. The Bến Thủy bridge, crossing into Bến Thủy, Vinh, crosses the Cả River on its Cửa Hội estuary.
- 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"
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