Muslims in India accounted for 9.9 per cent (of India’s population) in 1951, 10.8 per cent in 1971 and 11.3 per cent in 1981, and presumably about 12… - T. V. Rajeswar

Let us look at the map of Eastern India—starting from the North 24 Parganas district, proceeding through Nadia, Murshidabad, Malda and West Dinajpur before entering the narrow neck of land lying through Raiganj and Dalkola of Islampur sub-division before passing through the Kishanganj district of East Bihar to enter Siliguri. Proceed further and take a look at the north Bengal districts of Darjeeling, Jalpaiguri and Cooch Behar before entering Assam, and its districts of Dhubri, Goalpara, Bonaigaon, Kokrajhar and Barpeta. A more sensitive region in Asia is difficult to locate….

In 1991, the Muslim population in the border districts of West Bengal accounted for 56 per cent in South and North Parganas, 48 per cent in Nadia, 52 per cent in Murshidabad, 54 per cent in Malda and about 60 per cent in Islampur sub-division of West Dinajpur.

The Kishanganj district (of Bihar), which was part of Purnea district earlier, which is contiguous to the West Bengal area, also has a majority of Muslim population.