Suliehto. After Suliehto, it crosses the boundary line into Outer Mongolia by the same road to Khoshentun, Lukuchelu, and Yangto. Thence it crosses the Kerulen River to Otukunkholato, and enters the hilly region where it crosses the Kerulen watershed and the Chikoi watershed. The water from the Kerulen watershed flows into the Amur, and thence into the Pacific Ocean, while the water from the Chikoi watershed flows into Lake Baikal, and thence to the Arctic Ocean. After crossing the Chikoi watershed, it follows a branch of the Chikoi River to Kiakata. This line covers a distance of about 800 miles.
b. The Kalgan-Urga-Tannu Ola Line
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
