龍門山斷層 [ㄌㄨㄥˊ ㄇㄣˊ ㄕㄢ ㄉㄨㄢˋ ㄘㄥˊ; long2 men2 shan1 duan4 ceng2] Longmenshan fault line, a tectonically active thrust fault line at the northwest boundary of the Sichuan basin ◄ ►