Trashigang Dzongkhag shares its border with Mongar Dzongkhag in the west, Samdrup Jongkhar and Pemagatshel Dzongkhag in the South, TrashiYangtse Dzongkhag in the north and Indian state of Arunachal Pradesh in the east. Trashigang is 551 km away from Thimphu, the capital city and is one of the largest Dzongkhags in the Kingdom. The Dangmechu, one of the largest rivers in the country passes through the Dzongkhag. The altitude elevation ranges from 600 m to over 4500 m above sea level. The climate is mainly temperate with an annual rainfall between 1000 mm and 2000 mm. The lowest human settlement is found at an altitude of 550 m above sea level at Deno of Lumang Gewog and the highest at Merak at an altitude of 4600 m above sea level