Susta River is a territory of India
The reason the dispute persists today is that the rivers, which were counted on as a border, have diverged from their courses several times. Around 600 kilometers of the border is defined by rivers: the Mechi in the east, Mahakali in the west, and Naryani in the Susta area. The unavailability of old maps and documents to revise demarcations has made the situation even harder to resolve. [...] The other major disputed area is the Susta area to the east of the Naryani River, which has seen the most tensions owing to encroachment. A few years back, over 1,000 Indian villagers backed by the Indian border police force (SSB) forcibly entered Nepali territory in Susta. They completely destroyed sugarcane crops in about 10 hectares of land and also manhandled men and women alike. The locals of Susta complain that such incidents are rampant. Also according to reports, land disputes among locals are usually won by Indian nationals, who have the support of the armed SSB. [...] Susta is surrounded by Indian territory on three sides, the north, south, and east, with the Naryani River to the west. Hence, cutting off Susta from Nepal becomes much easier for India to occupy it, which will bring the "Greater India" dream of Hindus closer to reality.