 It has an international border with Burma's Shan State totaling in length.It is heavily mountainous and situated among the Hengduan Mountains, with the elevation ranging from at Mount Malihei () in Xincheng Township () to in Yakou Township ().Lancang County contains elements of both a tropical wet and dry climate and a humid subtropical climate (Köppen "Aw" and "Cwa", respectively), and is generally humid.