Mongar Dzongkhag is 450 km east of Thimphu, the capital city of Bhutan. It has an area of about 1,940.26 sq.kms 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 Dzongkhang 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 Dzongkhang.
It is divided into 17 gewogs and a Dungkhag located at Weringla for administrative purposes.
The population is estimated at nearly 50,000 as of 2017 equal numbers of male and female.
While maize and rice are grown abundantly, citrus fruits and vegetables, dairy and poultry products are increasingly becoming important sources of cash income.