Located in North Sikkim, 27 km uphill from Gangtok, on a slope stretching from Kabi to Phodong, Phensang Sangag Choling Monastery is among the largest monasteries in Sikkim. On his way to Northern zone in 1721, the 3rd Lhatsun Jigmed Pawo founded this monastery. Later in 1840, the monastery was rebuilt. 

At the moment, around 300 lamas of the Nyingmapa Buddhist order live in Phensang Monastery. Phensang hosts an annual festival on the 28th and 29th day of the 10th month of the Tibetan Calendar (usually December). Sacred dances are performed by the monks at this festival, which falls two days before the Sikkimese New Year.

The best times to visit are during the festival (from October to December), or in the warmer months from March to May. Like other monasteries in the area, Phensang also enjoys lovely views of the Himalayas, and is ideal for silent meditation and introspection.