evidence: The Susta territorial dispute has arisen as a result of the shifting of the course of the Gandak river. [...] - When the treaty was signed, Susta was on the right bank of the river Gandak which falls in Nepal territorial control. But, in due course of time, the river has changed its course and Susta now falls on the left bank of the Gandak, which is controlled by India. [...] Since, the Gandak change of course has been gradual, India claimed Susta as part of their territory as per international laws.