Sunsari District is one of 14 districts in Koshi province of eastern Nepal. The district is located in the eastern part of the Outer Terai and covers an area of 1,257 km2 (485 sq mi). According to the 2011 Nepal census, the population was 753,328. The district headquarters is located in Inaruwa.

Morang District is located in Koshi Province in eastern Nepal. It is an Outer Terai district, which borders Jhapa to the east, Dhankuta and Panchthar to the north, Sunsari to the west, and Bihar, India, to the south. Morang has one metropolitan city (Biratnagar), eight municipalities and eight rural municipalities. The total area of the district is 1,855 km2 (716 sq mi). The lowest elevation point is 60 meters and the highest is 2,410 meters above sea level. The headquarters of Morang is connected by the Koshi National Highway to the east–west Mahendra National Highway at Itahari, Sunsari. Morang is also connected to the Hill parts of the eastern region of Nepal. Morang is the core industrial sector for the eastern region of Nepal.