The construction of the Burma-Thailand railway in the vicinity of Hellfire Pass (Konyu Cutting) required many thousands of workers. The camps in which Australians were housed, together with other POWs, had various names with the prefix Konyu or Hintok (often spelled in various ways). Two of the major camps, Konyu River and Hintok River were on the banks of the Kwae Noi. The other camps were positioned along the only road heading north to the Burma-Thailand border (now Highway 323). Most camps were within walking distance of the railway, though the walk along jungle tracks was long, steep and treacherous, particularly during the monsoon. [Map contours source: ©2013 Google, Map data ©2013 Tele Atlas]