This Monastery is known as ‘Ugen Sangdoling’ and is situated at Naga, North Sikkim. Earlier, people were conducting Mani Puja in a Kutcha House. It follows Nyingmapa Sect of Mahayana Buddhism. The monastery was built in 1937 A.D. by the devotees on the advice of one High Lama Kyabgon Batrul Rinpoche who during his tour to northern Sikkim, halted at Naga Manilhakhang. Seeing a pitiable condition of the Lhakhang, the Rinpoche advised them to build a stable monastery since there is no monastery nearby Naga area where devotees could go to offer prayer. Presently, a bigger Monastery is being built  and is yet to be completed.