Mongar district, previously known as Zhongar, is one of the five districts that make up Eastern Bhutan. It borders Bumthang, Lhuentse, Pema Gatshel, and Trashigang.
The journey from Bumthang to Mongar offers one of the most spectacular views of Himalayas crossing the 3800m high Thrimshingla pass. The elevation of the valley is about 1600m. Mongar is the second largest town next to Trashigang in the east. The valley also marks the beginning of eastern Bhutan.