TheLuan River (Chinese:滦河;pinyin:Luánhé, formerly known asLei Shui, orRu Shui) is a river in China.
The river flows northwards from its source in the province ofHebei into the province ofInner Mongolia, and then flows southeast back intoHebei to its mouth on theBohai Sea. Theheadstream is known as Shandian River. This part of the river flows near the ancient Mongol capital city ofShangdu. Another important settlement in this section isDuolun. From here, the river's course turns to the southeast.[1] Its length is about 600 km. One subsidiary is theYixun He, which runs through Hebei.
During its course, the Luan also passes by the Great Wall. After Chengde, the river is navigable.[2] The largest city along the river's course isChengde.
Geological evidence such as the presence ofsuevite suggests there is animpact crater in the area.[3] It is estimated to be between 70 and 170 km in diameter with an age of 129 ± 3 Ma. The circular course of Luan River as it goes from Inner Mongolia back to Hebei is said to define part of the crater's outline.
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39°25′48″N119°18′12″E / 39.43000°N 119.30333°E /39.43000; 119.30333
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