valley of the joint river goes down on its way eastwards between the Transhimalaya and Himalaya. Unggung gäbri and Alung- are mountain shoulders to the S. S. E. and S. To the S. 31° W. is seen the valley by which the great Tsgngpo comes to the confluence with Mount Kha to its west. To the N. 75° W. is the valley of the Chaktak-tsangpo coming down to the confluence. Pan. 205, Tab. 37 , is drawn from Camp CLXVIII showing the valley of the great Tsangpo above the confluence, and practically the same view as S. 31° W. on Pan. 207 only under a somewhat changed perspective.
The whole distance of the third crossing, according to the marches given above, is 247.2 km. The first calculation, found on p. 289 of Vol. III, was 237.9 km. as measured on the construction map. Thus, in spite of the violence exerted upon the original map for entering it in the net of co-ordinates, the two maps agree in a satisfactory way.
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