Trashigang, "The Jewel of the East", spans the easternmost corners of the kingdom, skirting up to the edge of the Indian state of Arunachal Pradesh. It is the country’s largest district, with an altitude ranging from 600 m to over 4000 m.
Bhutan’s largest river, Dangme Chhu, flows through this district. Trashigang town is set on a scenic hillside and was once a bustling trade centre for merchants looking to barter their goods in Tibet. Today, it is the junction of the East-West highway with road connections to Samdrup Jongkhar and the Indian state of Assam. Trashigang town is also the principle market place for the semi-nomadic people of Merak and Sakteng, whose unique way of dressing stands out from the ordinary Bhutanese Gho and Kira.
Trashigang is home to the Sakteng Wildlife Sanctuary. The Sakteng Wildlife Sanctuary, one of ten protected areas of Bhutan, was created in part to protect the migoi, a type of yeti, in whose existence most Bhutanese believe. The sanctuary covers the eastern third of the district (the gewogs of Merak and Sakteng), and is connected via biological corridor to Khaling Wildlife Sanctuary in Samdrup Jongkhar District to the south.
Trashigang contains one of the most reputed colleges in the country, the Sherubtse College. Sherubtse College was the first accredited college in Bhutan, founded in 1966 by a group of Jesuits under the leadership of William Mackey. As of 2003 it became part of the newly created Royal University of Bhutan system that comprises all public post-secondary schools in Bhutan. The college is located below the Yonphula domestic airport.