In the late 1800s, in order to facilitate trade between the Indian subcontinent and the Tarim Basin, the British attempted to promote a caravan route via the Chang Chenmo Valley as an alternative to the difficult and tariffed Karakoram Pass.[4] Tso Tang was on this route. British Army surgeon Henry Cayley who was part of a mission to Yarkand that took this route noted the lake as "brackish but quite potable."[3]
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