The area shown in the adjacent map covers two physiographic regions – the Barind in the east and the tal in the west.

The area lying to the west of the Mahananda River, the tal, is a flat low land and "is strewn with innumerable marshes, bils and oxbow lakes."

An addendum was made on 6 September 2011, to add new rail routes for facilitating overland transit traffic between Bangladesh and Nepal.

[5][6] Bangladesh started export of fertilizer to Nepal utilizing the Rahanpur-Singhabad transit point in November 2011.

[7] The Singhabad-Rohanpur transit point allows through transport of goods from Raxaul in Nepal to Khulna in Bangladesh, without any transhipment, but is rarely used.