Sara Umga Pass Trek Sara Umga Pass/La (32°12’13.7″N 77°30’49.3″E) approximately at ~ 5020 m, is a fairly difficult mountain pass and trekking trail in Himachal Pradesh.  This pass connects the lush Parvati – Tosh river valley in Kullu region to that with the rugged Chandra valley in Lahaul. Table of