T'u-men

"Article V.—In consideration of the numerous difficulties arising from the authority exercised by local officials over the legal traffic at such places on the boundary as I-chou, Hui-ning, and Ch’ing-yuan, it has now been decided that the people on the frontier shall be free to go to and fro and trade as they please at Ts’e-men and I-chou on the two sides of the Ya-lu River, and at Hun-ch’un and Hui-ning on the two sides of the T’u-men River."