Boundary monument introduction: Standing at No. 815 and 816 at Erlian-Zhamin-Uud Port on the China-Mongolia border, it is the only double-numbered boundary monument at the national border site. The city of Menoud is 4.5 km away. The current four boundary monuments No. 815 (1), 815 (2), 816 (1), and 816 (2) stand on both sides of the two railways respectively. The marble monument body has the gilded national emblems of the two countries embedded on both sides. It is solemn and solemn. .