Mukhiyapatti Musharniya is a rural municipality in Dhanusha District in Province No. 2 of south-eastern Nepal established in 2073 BS. As of 2011 Nepal census, it has a population of 25,482. It was formed by joining Tulsiyahi Nikas, Tulsiyani Jabdi, Baheda Bela and former Mukhiyapatti Musharniya Village development committees. The total area of Nagarain municipality is 26.84 km<sup>2</sup>.
On a geographical basis, it is the lowest point in Nepal from sea level, the highest being the peak of Mount Everest.