Tsum Valley and Manaslu Trek: 22 Days outfitterhimalaya.com Manaslu Tsum Valley Trekking: 22 Days Adventure Holidays The Manaslu Larke Pass with Tsum Valley Trek is an Adventure hike into the virgin territory of the Nepal Himalayas where the remote wilderness displays a mirage of natural beauty & cultural heritages, Manaslu with Tsum Valley Trek is adventurous, culturally enriching, gleaming with flora & fauna.