Ac This is a super seven-days trek, it goes into Northern Bhutan to the land of yaks- herders. To the base of mount jumolhari at 7314m [24,000feet] there are fabulous views of the mountain And exceptional flora. You will encounter many yak- herders but few villages. It is one of the best treks as is not too long and not too short; the maximum altitude is 4,700m [15000feet] This trek can be done from September, October and November and April to May.