Nepal Prime Minister Balen Shah has sparked a political debate after saying that Nepal may have encroached on Indian territory in some places, just as India is often accused of encroaching on Nepal's land.

His remarks challenged a narrative that has shaped Nepal's border debate for years.

These comments have once again brought the India-Nepal border dispute into focus.

And why are the two neighbours still debating a border drawn more than 200 years ago?

The story begins with the Treaty of Sugauli, signed in 1816 after the Anglo-Nepalese War.