James Rennell (1742-1830) had been recognised as the greatest geographer that Great Britain had produced till the late 19th century. He started his career
as sailor but gradually upgraded himself to an outstanding cartographer, a hydrographer and a comparative geographer. He was pioneer in mapping the area under the administrative control of the East India Company and became the first Surveyor General of Bengal
and that of India. In the second half of 18th Century when James Rennel surveyed Bengal and Bihar and produce a A Bengal Atlas. The famous Atlas in many ways, establishes the linkages between the then river system, navigation, agrarian economy and colonial politics.