Detail of the index map for Innermostasia - map sheets 32, 33, 35, 36, 38, 39 - showing the area around Tun-huang and An-hsi. At An-hsi the red line northward is Stein's route to Hami and the modern highway. The two red lines at the left edge are Stein's and Lal Singh's routes across the Lop salt sea to the caravan route near Kum-toghrak. Sections of the Han wall show along the south bank of the Su-lo Ho west of An-hsi.