HOW THE WORLD CAME TO KNOW THAT TSANGPO AND BRAHMAPUTRA ARE ONE AND THE SAME River.
It is thanks to the person in the picture. His name was Kinthup, a tailor by profession.
British officers sent him on a very dangerous mission because despite being illiterate he had amazing graphic memory.
As we know now Brahmaputra which originates from Tibet and flows East and suddenly enters very deep gorges to loose height and enter North East India. It is known as Tsangpo in Tibet . But during 1880, it’s path was not mapped. Some people even doubted that these are two different rivers.
Tibet was then a closed country and not under British. When the sent Kinthup through Sikkim in 1880 secretly to go as far as possible along the river. Plan was that Kinthup would throw wooden logs (specially marked) into the river in Tibet and British troops were stationed in India. If it was the same river, they soldiers will definitely retrieve them.
He remained for 4 years on his mission facing lots of hardships, arrests, slavery , sleeping on treetops. Returned back in 1884.