This line starts from Kalgan at the Great Wall, and proceeds northwestward up the plateau, crosses a range of hills into the Mongolian prairie, and goes to Mingan, Boroldshi, Ude, and Khobor, where it crosses the Dolon Nor-Urumochi trunk line. After Khobor, it proceeds across the vast and rich pasture of Mubulan, then proceeds in a straight line through Mukata and Nalaiha to Urga. From Urga, it goes into the hilly district crossing Selenga Valley to a point opposite the southern end of Lake Kos Gol, and then turns northward across a range of mountains to Khatkhyl on the southern shore of Kos Gol. After Khatkhyl, it skirts Kos Gol Lake along the western shore for some distance, then turns northwestward and westward, following the course of the Khua Kem River to a point near its exit at the frontier line, then turns southwestward up the Kemtshik Valley to its headwater, passes through Pakuoshwo, and ends at the boundary line between the Russian and Chinese territories. This line covers a distance of about 1,700 miles. c. The Suiyuan-Uliassutai-Kobdo Line This line starts from Suiyuan in the northwestern corner of Shansi, and proceeds in a northwesterly direction across the hilly country into the Mongolian pasture to Tolibulyk, where it crosses the Great Northern Port-Hami line, and the Great Eastern Port-Urga line. After Tolibulyk, it proceeds in a straight line in the same direction passing through Barunsudshi to the capital of Tuchetu. Thence it continues in the same straight line northwestward to Gorida. After Gorida, it follows the caravan road to Kolitikolik where it crosses the Great Northern Port-Urumochi trunk line. From Kolitikolik, the line turns northwestward, then westward and proceeds across many streams and valleys and passes by many small towns to Uliassutai. At Uliassutai, it crosses the B. Junction-Frontier branch of the Great Eastern Port-Urumochi line. After Uliassutai, the line proceeds westward following the trade road, passes through Khuduku, Bogu, Durganor, and Sakhibuluk to Kobdo. Thence the line turns northwestward to Khonga, Ukha, and Clegei, then westward to Beleu and ends at the frontier. This line is about 1,500 miles long. d. The Tsingpien-Tannu Ola Line