Nain Singh Rawat (21 October 1830 – 1 February 1882), was one of the first of the late 19th century Indian explorers (pundits) who explored the Himalayas for the British.
He hailed from the Johar Valley of Kumaon.
He surveyed the trade route through Nepal to Tibet, determined for the first time the location and altitude of Lhasa, and surveyed a large section of the Brahmaputra.
He walked "1,580 miles, or 3,160,000 paces, each counted."