Geography of Koshi Province in eastern Nepal is very diverse, of highest peaks of Himalayas in northern extremes to terai region to south.
Koshi Province has three folds; northern higher mountains, mid-hills and southern terai.
This region comprises 8 districts of Koshi Province: Panchthar, Tehrathum, Dhankuta, Bhojpur, Khotang, Okhaldhunga, Ilam and Udayapur.
The southern part of the province has fertile agricultural plain land which is called terai.
The terai region of Koshi Province comprises 3 districts: Jhapa, Morang and Sunsari.