East Street Community, Chengguan Town, Chengxian County. According to Baidu map, Dongxin Lane in Chengxian County is one of the streets under the jurisdiction of Dongjie Community in Chengguan Town of Chengxian County. Chengxian County, which belongs to Longnan City, Gansu Province, is located in the south of Gansu Province and the northeast of Longnan City. Chengxian County, formerly known as Chengzhou, was founded in the Western Wei Dynasty and was reduced to a county in the Ming Dynasty.