[1] The border starts in the west at the western tripoint with Tibet, China, proceeding from there broadly southwards across Mount Gipmochi and down to the Jaldhaka River.

It then utilises this river for a period before turning south-westwards and then east via a series of irregular overland lines that broadly follow the foothills of the Himalayas, notably Dangme Chhu peak.

[2] Boundary disputes flared up repeatedly in the first half of the 1800s, with Britain annexing the Bengal and Assam Duars in 1841–42.

[4][5][6] In 1947 India gained independence from Britain, and two years later it signed a treaty with Bhutan by which it recognised the country's sovereignty, though retaining significant influence over its foreign affairs.

[10] The second is the Darranga Immigration checkpoint between the Eastern border town of Samdrupjongkhar, Bhutan and the state of Assam, India.