About Dotma
Dotma is a town within the District of Kokrajhar in the state of Assam, North East India. It is one of the Revenue circles and developmental blocks in the Kokrajhar district. At close of the Bhutan War of 1864, the British and the Bhutani signed the Sinchula Agreement in 1865. Under the agreement, the 18th Bhutan Duars were divided into the Eastern and Western Duars. The portion of the land lying between the Manas and Sankosh rivers was formed into the Eastern Duars district and was administered by Deputy Commissioner with headquarter at Dotma.
Source: Wikipedia