<Tr> <Td_colspan="2"> Area </Td> <Td> 140,118 km (54,100 sq mi) </Td> </Tr> <P> Assam Province was a province of British India, created in 1911 by the partition of the Eastern Bengal and Assam Province . Its capital was in Shillong . </P> <P> The Assam territory was first separated from Bengal in 1874 as the' North - East Frontier' non-regulation province . It was incorporated into the new province of Eastern Bengal and Assam in 1905 and re-established as a province in 1912 . </P> <P> In 1824 Assam was occupied by British forces following the First Anglo - Burmese War and on 24 February 1826 it was ceded to Britain by Burma . Between 1826 and 1832 Assam was made part of Bengal under the Bengal Presidency . From 1832 to October 1838 the Assam princely state was restored in Upper Assam while the British ruled in Lower Assam . Purandar Singha was allowed to rule as king of Upper Assam in 1833, but after that brief period Assam was annexed to Bengal by the British . In 1873 British political control was imposed on western Naga communities . On 6 February 1874 Assam, including Sylhet, was severed from Bengal to form the Assam Chief - Commissionership, also known as the' North - East Frontier' . Shillong was chosen as the capital of the Non-Regulation Province of Assam in September 1874 . The Lushai Hills were transferred to Assam in 1897 . The new Commissionership included the five districts of Assam proper (Kamrup, Nagaon, Darrang, Sibsagar and Lakhimpur), Khasi - Jaintia Hills, Garo Hills, Naga Hills, Goalpara and Sylhet - Cachar comprising about 54,100 sq miles . Ironically, Cooch Behar a historical part of Assam, was left out . </P>

In which year was assam separated from bengal