National Geographic : 1930 Feb
THE BA VALLEY OF TIBET, FROM ITS SOUTHERN RIM IN THE BA PLAIN; ELEVATION, 10,400 FEET The willow-lined Ba stream flows through eroded loess and gravel slopes. On the terraces in the valley (center and left) aretheonly Tibetan villages in this sea of grass. The inhabitants are called "the people living under the ground." The Jupar Range,with itsbare southern slopes, isvisible above the Ba Plain.