A Pa Chai Border Marker Zero is located in Dien Bien province’s Muong Nhe district. It stands at the point which separates Vietnam, Laos and China. Signpost to Border Marker Zero (Photo: VNA) Staircases leading to Border Marker Zer Border Marker Zero is located on Khoan La San peak, at an altitude of 1,864m. This is the westernmost point of the country (Photo: VNA) Staircases leading to Border Marker Zero (Photo: VNA) Tourists visit and pose for photos at Border Marker Zero (Photo: VNA)