This line starts from Lanchow, on the same track of the Lhasa-Lanchow line as far as the southeastern corner of the Lake Kokonor. Thence it proceeds on its own track by skirting along the southern shore of Lake Kokonor to Dulankit, where it turns southwestward to Dzunsasak. From Dzunsasak, the line proceeds in a westerly course along the southern side of the Zaidam Swamp, and passes Tunyueh, Halori, and Golmot to Hatikair. After Hatikair, the line turns northwestward by Baipa, Nolinjoha, to Orsinte. Thence turning more northward, it proceeds across the mountain range by Tsesinvitusuik and Tuntunomik to Chochiang, where it ends by joining the Ansi-Iden and Chochiang-Koria lines, covering a distance of 700 miles. j. The Chengtu-Dzunsasak Line This line starts from Chengtu and proceeds to Kwanhsien on the track of the Lhasa-Chengtu line, thence northward on its own track by Wenchuan, to Mauchow. Then, it proceeds northwestward following the course of the Minkiang to Sungpan. After Sungpan, it ascends the Min Valley passing Tungpi to Shangleyao, where it crosses the watershed from the Yangtze River side to that of the Hoangho. Thence the line proceeds to Orguseri, and following a branch of the Hoangho to the northwestern turn of its main stream, it proceeds along its right bank via Chahuntsin to Peilelachabu. There it crosses the Hoangho to the northwest turn of the old imperial road, where it joins the Lhasa-Lanchow line and proceeds as far as Lanipar. Then turning northwestward, it proceeds by its own line to Dzunsasak, where it ends by joining the Lanchow-Chochiang line. This line covers a distance of 650 miles. k. The Ningyuan-Cherchen Line This line starts from Ningyuan and proceeds in a northwestward direction via Hwaiyuanchen to the Yalungkiang. Then it ascends along the left side of that river to Yakiang, and crossing to the right side of that river it proceeds by the old post road to Siolo, where it turns away from the river and follows the same post road to Litang. From Litang it proceeds in the same direction but follows another road to Kangtu, on the left side of the Kinshakiang. Following the same side of the river, it proceeds to Sawusantusze, where it crosses the Lhasa-Chengtu line. After Sawusantusze, the line continues in the same direction and follows the same side of the Kinshakiang via Tashigompa, to the Huhusair Bridge, where it crosses the Lhasa-Lanchow line. Then following a northern branch of the Kinshakiang to its source and crossing the watershed, it proceeds along the caravan road by Hsinszukiang and Olokung to Cherchen, where it ends, covering a distance of about 1,350 miles. This is the longest line of this system. l. The Chengtu-Menkong Line