Overview
Lieutenant-Colonel Sir Henry Strachey (1816–1912) was a British officer of the Bengal Army. Despite a longstanding prohibition by the Tibetan authorities on the entry of Europeans into Tibet, Strachey surveyed parts of western Tibet during the late 1840s.
He was the second son of Edward Strachey, second son of Sir Henry Strachey, 1st Baronet. His brothers included Sir Richard Strachey, Sir John Strachey and Sir Edward Strachey, 3rd Baronet.
Tibetan surveys
In 1846, while a lieutenant of the 66th Regiment of Bengal Native Infantry, Strachey explored the Tibetan regions surrounding Lakes Manasarovar and Rakshastal. He found a channel between the lakes, suggesting that Manasarovar, and not Rakshastal, was the source of the Sutlej River. Strachey's brother Richard, with J. E. Winterbottom, continued the exploration of the lakes in 1848.
From Wikipedia (CC BY-SA 4.0).