Manaslu and Round Annapurna Trek is one of the best Adventurous Trekking with spiritial experiences of Buddhist Culture and practices in Tsum Valley, Nubri Vallay of Manaslu region, Ngesyang (Manang) Valley and Mustang Valley.
Even more Buddhist Trekkers' special sanctuary in this region is Kyimulung one of the Beyul (Buddhist Hidden Land) prophesized by Guru Rinpoche/Padma Sambhava. Which is the heart lands of Tibetan Buddhism among 7 most important Beyuls.
Tsum Valley is one of the best peaceful Buddhist Valley in Nepal. There are so many Chorten (Tsorten) all over the trails, villages and mountains. There are not only Monasteries, about 800 years old nunneries are there too. Rachen Gumba is also one of the big nunnery in the area.