The Gianh River (Vietnamese: Sông Gianh) is a river in the Quảng Bình Province of Vietnam's North Central Coast (Bắc Trung Bộ).
It was the border between ruling families during the partition of Vietnam following the Trịnh–Nguyễn War of the 17th century, serving to effectively divide the country between northern and southern regions.
On 25 January 2009 a boat accident took place on the river, resulting in the deaths of 42 people and the disappearance of five others.
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