The Dooars or Duars (/duˈɑːrz/) are the alluvial floodplains in eastern-northeastern India and southern Bhutan that lie south of the outer foothills of the Himalayas and north of the Brahmaputra River basin.

[1] This region is divided by the Sankosh River into Eastern and Western Dooars, consisting of an area of 880 km2 (340 sq mi).

The Dooars belonged to the Kamata Kingdom under the Koch dynasty;[1] They acted as a trade route between Assam and Bhutan.

During the Ahom–Mughal conflicts in the mid 17th century, the Bhutias attempted to extend their authority as far as Gohain Kamal Ali.

Therefore, an agreement was drawn, and the Darrang Duars went to the hands of Bhutias on the condition of annual tribute to Ahom side.

[4] This region was controlled by the kingdom of Bhutan when British India annexed it in 1865 after the Duar War under the command of Captain Hedayat Ali.

[6] Similar office existed under the Bhutan government, the Subah was selected by the provincial governors called Ponlops.

[9] The Koriapar Dooar was held by the chiefs of the Monpa people who were subordinate to the ruler of Tawang, who in turn were a tributary to the Tibetan government at Lhasa.

[citation needed] This northern Bengal cities are well connected with the rest of country by road, air and railway and is the business hub of the region.

Cooch Behar, Alipurduar, Dhupguri, Malbazar, Mainaguri, Falakata and Birpara are the major cities of the Dooars in West Bengal, and Kishanganj in Bihar.