Candido Rondon found the River of Doubt, now the Rio Roosevelt, which flows in this country's Amazonas State
The 
expedition, led by Roosevelt and Cndido Rondon, Brazil's... [DOC] [TLE] Portuguese Version - Norman Gall [PAR] Nevertheless, the Strategic Telegraph Line from Mato Grosso to Amazonas was 
... by an explorer and army engineer, Colonel Candido Mariano da Silva Rondon, 
... drowning in the rapids of the River of Doubt (later renamed Rio Roosevelt), 
and ... Brazil's population centers and the western Amazon's rich rubber country.