Cangxi Town ,situated at the Sichuan basin , east of the Bashan , west of the Jianmen , north of the Beiyuan , was called the qin long suo yao and was regarsed as the barrier of nothern shu , spanning from north latitude 31°37’ to 32°10’ and east longitude from 105°43’ to 106°28’ . Xiwudang is two miles away from the eastern Cangxi Town .