Answer:
Nepal is a nation located in the Himalayan Mountains, bordering India and China, being a kind of buffer nation between both powers.
Given its location, it does not have access to the sea, which makes maritime transport impossible. In addition, the rivers that pass through its territory are at such an altitude that river transport is impossible.
On the other hand, its mountainous location makes the construction of routes that connect the nation with its neighbors complex, since they must avoid the highest mountains on the planet in a few kilometers of range. Even so, some routes cross the country from east to west, delivering Nepalese products to China and India.
This makes air transport the most effective within Nepalese territory, where there are some 44 airports located, the most important being that of its capital, Kathmandu.