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