 The county seat and the largest town is Tafeng ().Lanshan is a mountainous county located in the east of Jiuyi Mountains on the northern side of the middle Nanling Range.The county is bordered to the southwest by Jianghua County, to the northwest by Ningyuan County, to the northeast by Jiahe County, to the east by Linwu County, to the southeast by Lianzhou City of Guangdong.