Nepal is a world by itself

The Himalaya, Mahabharat, and Churia mountains are running parallel from east to west. They are not one unbroken chain of the mountain. The entries range is a series of mountain clusters which have been divided by river flowing through them. Every river that flows down in a tributary to one of Nepal's three great rivers. air the water of eastern Nepal flow into Koshi which is known as Saptakoshi. River of central Nepal flow into Gandaki which is known as Sapta Gandaki and Karnali represents the far west. Bagmati of Kathmandu flows out to the Gangas independently.so geographically Nepal is divided 3 mountains walls running from east running from north to south.Every piece has its own special feature.

As an elevation wise Nepal can be divided into three parts: Himalayan region, Mid Hilly region and The Terai region.
Image source: Google