evidence: Susta, is another disputed area in the India-Nepal border. It is a 145-sq-km area that had fallen on the Indian side after the River Gandak changed course. During the 1816 Treaty of Sugauli, the west side of the Gandak river belongs to Nepal and the Eastern part of the river belongs to India. But due to frequent change of course by the Gandak river, the Susta region at present belongs to the Eastern part. This is not accepted by Nepal. [...] In the 1980s, India and Nepal set up the Joint Technical Level Boundary Working Group to delineate their boundary. The group demarcated every border except Kalapani and Susta area.