== Problem with map == 

  

 The above map shown in this article seems to conflate the Y-T catchment with that of the upper Indus.  AFAIK the Y-T rises east of the twin lakes Manasarovar and Rakshastal appearing just left of "Yarlung Tsangpo" on the map. 

 Another map associated with the Brahmaputra River article may be more accurate in this respect: