Nepal is a small landlocked  country which is 800 km long and 200 km wide. In the longitudinal 200 km wide, the terrain changes from glaciers along Tibetan border to the flat jungles in Terai, barely 150 meters above sea level. The country does not ascend gradually from the plains. Rather, it rises in several chains of hills that lie in an east-west direction, finally terminating in the highest hills in the world -the Himalaya. Beyond the Himalaya is the 5000 meter high plateau of Tibet. Visitors can find great diversity in Nepal. Villages embrace many ethnic groups and cultures. The terrain changes from tropical jungle to high glaciated peaks in only 150 km. From the start, the towering peaks of the Himalaya provide one of the highlights of a trek. As plane approaches Kathmandu these peaks appear to be small clouds on the horizon. The mountains become more definable and seem to reach impossible heights as visitor get closer and finally land at Kathmandu's Tribhuvan Airport.