Serindia Plan 33 - Detailed map of ancient Chinese Limes west of Tun-huang - We have color versions of this and other maps that show locations of many towers along the left bank of the Su-lo Ho - In this one we see towers from Tvid at the west end to Txxiiig at the eastern border. - Towers Tx viiia and Txviiib are along the route south to Tun-huang. Stein numbered these towers more or less in the order in which he examined them.