Lóngmén ShÃÂn, Mount Longmen or Longmen Mountain is a mountain in Shanxi province, China. In MarchâÂÂApril 2010, the Wangjialing coal mine flood occurred here.
Lóngmén ShÃÂn is where the Yellow River abruptly leaves the vast, rugged expanse of the Loess Plateau that spreads out in the mountain's north and west to enter a plain which connects both to the nearby Linfen Basin in the east and to the Guanzhong Plain further southwest. The mountain is thus a part of the Loess Plateau's southern edge. At the same time, it forms the south-western extreme point of the Lüliang Mountains, a range that runs parallel to the river as it flows south.
The spot at Lóngmén ShÃÂn's southwestern tip where the Yellow River breaks through is called YÃÂménkÃÂu (, âÂÂYu's doorway, or gateâÂÂ). Here, three bridges span the Yellow River. As there are no other nearby bridges either upstream or downstream, this is the only dry connection from Xiangning County and Hejin (in Shanxi province) across the river to Hancheng (in Shaanxi province), hence the name Xiang-Han Yellow River Bridge(s) ().
From YÃÂménkÃÂu, Lóngmén ShÃÂn stretches in a straight northeasterly direction and then slightly bends eastward toward its opposite end, where a ravine () breaks through to the plain, separating Lóngmén ShÃÂn from the rest of the Lüliang Mountains.
Administratively, the main part of Lóngmén ShÃÂn is in the county-level city of Hejin in the prefecture-level city of Yuncheng; only the mountain's northeastern end reaches into Xiangning County in the prefecture-level city of Linfen. All these are in the province of Shanxi, but the similarly named province of Shaanxi is just across the Yellow River that forms the boundary between these two provinces until much further upstream and downstream.