Originating from China, the Black River passes through some Northwestern localities of Vietnam, including Lai Chau, Dien Bien, Son La, Hoa Binh and Phu Tho provinces and joins the Red and Lo rivers in Phu Tho province before reaching the sea. Previously, the river was well-known for its falls and rapids. Only experienced rowers are able to row boats down the stream. Competence of boat rowers on the river is described in Nguyen Tuan’s literature work “Boatman on the Da River.”