River in Ninh Bình and Nam Định, Vietnam
The Day River (Vietnamese: Sông Đáy) is a river in Vietnam. It was formerly known as Hát River (Sông Hát or Hát Giang) or Gián Khẩu River (Sông Gián Khẩu). The river is a distributary of the Red River, draining into the Gulf of Tonkin.
The river has a length of 240 km[1] and has a drainage basin of more than 7,500 km2,[2] flowing through Hanoi, and the provinces of Hòa Bình, Hà Nam, Ninh Bình and Nam Định.
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