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.

Koshi Province is the autonomous easternmost province adopted on 20 September 2015 by Constitution of Nepal. The province is rich in natural resources, tourist attractions, recreational activities, and natural beauty. The province covers an area of 25,905 km2 (10,002 sq mi), about 17.5% of the country's total area. With the industrial city of Biratnagar as its capital, the province includes major eastern towns of Birtamod, Sundar Haraincha, Damak, Dharan, Itahari, Triyuga Municipality and Mechinagar, and the Mount Everest, Kangchenjunga and Ama Dablam. Koshi River, the largest river of the nation, forms the province's western boundary. Under the First-past-the-post voting system issued by the Constituency Delimitation Commission, Nepal, the province hosts 28 parliamentary seats and 56 provincial assembly seats.