The range runs in a roughly northeast to southwest direction, roughly from
Guangyuan near the province's northeastern border, to the western part of the
Chengdu Prefecture, in the central part of the province, where it approaches the southern end of the
Qionglai Range. The Longmen Mountains form the northwestern rim of the
Sichuan basin. The uplift of the Longmen Mountains is a result of vertical slippage on the
Longmenshan Fault. The Longmen Mountains represent the eastern rim of the immense
Tibetan Plateau. Some maps use the name "Longmen Mountains" only for the northeastern section of the range, while the taller southwestern section is labeled
Chaping Mountains (). The range's highest point is Mt. Jiudeng or Jiudengshan (), at above sea level. ==References==