Detail of map 35 in Innermostasia - this shows the terminal of the Su-lo Ho with the caravan routes through Toghrak-bulak and Besh-toghrak and especially the western watch towers and end of the Han line.Stein numbered the towers more or less in the order he studied them - Towers I and II are detached watch towers he came to first on north bank of the Su-lo Ho - Towers III and IV are immediately to the south - Then towers V and VI are detached far to the southwest to cover the end of the line.