The river is 439 kilometres (273 miles) in length, and is generally deep. It is the fifth-longest river on theKorean peninsula and the second-longest in North Korea.Pyongyang is approximately 110 km upstream from the mouth,Sunchon 192 km upstream, andTaehŭng 414 km upstream.[citation needed] Because of its depth, it is widely used for river transport; it is navigable by large ships up to 65 km inland, although most commercial traffic stops atSongrim.
The kingdom ofKoguryo was founded on its shores. Many archeological sites dating to theNeolithic andBronze Age have been found along the river, as well as relics and ruins from Koguryo. It was also once known as the Pae River (패수;浿水;P’aesu).[4]
In 1986, the government completed the 8-km-longWest Sea Barrage, with three locks and 36sluices, at the mouth of the Taedong River near Namp'o.[3] The dam acts to control floodwater and to irrigate lands newly reclaimed from the Korea Gulf.[3] The dam prevents mixing of the outgoing river water with seawater, leading to an increase of contaminants concentration.[7] Other dams, such as theNyongwon Power Station, have been built to provide energy to the country.[8]