Mongar Dzongkhag is 460 km east of Thimphu, the capital city of Bhutan. It lies between 27.25˚ latitude and 91.2˚ longitude. It has an area of about 1,940.26 sq.km with elevation ranging from 400-4000 meters above sea level. The lower and the southern parts are sub tropical while northern and the higher regions have temperate climatic conditions. Summer can be hot and humid and winter cold.
The Dzongkhag is enclaved by Trashigang, Lhuentshe, Pema Gatshel, Samdrup Jongkhar, Zhemgang and Bumthang Dzongkhags. The Kuri Chhu, Sheri Chhu and Dangme Chhu are important rivers in the Dzongkhag.
The Dzongkhag is divided in to 17 gewogs and a Dungkhag located at Weringla for administrative purposes and three Demkhongs viz Drametse-Ngatshang, Kengkhar- Weringla and Mongar Demkhongs for the purpose of elections.
Gongdue and Silambi under Weringla Dungkhag and Kengkhar, Jurmed and Saling gewog fall under Kengkhar Weringla Demkhong, Mongar, Chali, Drepong, Tsakaling and Tsamang gewogs fall under Mongar Demkhong and Balam, Chaskar, Drametse, Narang, Ngatshang, Sherimung and Thangrong gewogs come under Drametse Ngatshang Demkhong.
The population is estimated at 41852 for year 2013 with male and female almost equally divided.
While maize and rice are grown abundantly, citrus fruits and vegetables, dairy and poultry products are increasingly becoming important sources of cash income.
The Dzongkhag has 63.5 km of feeder roads, 533.4 km of farm road, and 18.5 km of power tiller tracks. The east west National High way passes through the heart of the Dzongkhag.
The Dzongkhag has 54 Schools (13 ECR, 28 PS, 5 LSS, 4 MSS, 3 HSS and 1 Pvt. HSS with total of 9,829 students, 1 Regional Referral Hospital, 23 Basic Health Units (BHU’s), 52 Outreach Clinics (ORC’s)s and 9 Ambulance caters health services. There are also 17 Renewable Natural Resources Extension Center (RNR) and one Renewable Natural Resources Research and Development Center located at Wengkhar.