This river runs east for 700 miles before turning south through Arunachal Pradesh state and Assam state.  
It is navigable for two long stretches - for the 400 miles downstream from La-Tzu and for the 700-mile stretch before it reaches Dibrugarh.  Its three major tributaries are the Tista, Torsa, and Jaldhaka Rivers, and it also joins the Meghna River with which it forms a vast delta.  This river runs east for 700 miles before turning south through Arunachal Pradesh state and Assam state.  FTP, name this river that begins in the Tibetan Himalayas and reaches a confluence with the Ganges before emptying into the Bay of Bengal.
It is navigable for two long stretches - for the 400 miles downstream from La-Tzu and for the 700-mile stretch before it reaches Dibrugarh.  
Brahmaputra River or Jamuna River or Tsang-po River