Located in the south of luermen river in the open waters of taijiang or nanshan the name of the islands in anping and cikunshen, sihcao, also known as beishanwei in the past, was part of the inland sea and got this name because it used to abound with beach naupaka scaevola sericea vahl . when four lakes formed by the sedimentation of sand and mud flushed from taijiang after the diversion of zongwen river in 1823 daoguang 3rd year, cing dynasty, these lakes have since covered with grass 有关元宵节的起源，认为是汉代宫廷的一种祭典演变而来；另一种是源自民间的三元节，旧俗以农历正月十五日为上元即天官大帝的生日，而农历七月十五日为中元即地官大帝的生日，而农历十月十五日为下元即水官大帝的生日，而这三元中又以上元最热闹也最受重视。
