Nepal Himalaya is known as the rooftop of the world. The Himalayas are the highest mountains in the world. Their scenery is legendary. These mountains have had an air of mystery until recently. Even today, the vast area of the Himalaya is untouched. It has always remained a source of fascination and inspiration for people from all walks of life in the world. Himalaya ("Him" means snow and "Alaya" means abode), the abode of snow and the Gods, extends about 2500 Kilometers. The Brahmaputra (Assam) in the east and Indus river in the west demarcate the length of the Himalaya. It is 300 Kms wide and rises nine kilometers above the sea level. 

The Nepal Himalaya is in the centre of the Himalayan range. Eight peaks that exceed 8000 metres including the world's highest peak Mt Everest are the prominent members of Nepal Himalaya. It has a convergence of 1310 magnificent peaks over 6,000 metres. Nepal has become famous through out the world due to these mountains. 

It is a very interesting thing to know that there was a sea (the Tethys sea) between Indian Gondwana continent (Indian sub-continent and Eurasian continent). Around 70 and 80 million years ago, the Himalaya began to come into existence. It is a peak of each evolution only about 10 to 20 million years back. Therefore, the Himalaya is extremely young and geologically active. According to geologists, mountains are growing at a rate of 15 cm (6 inch) a year as the Indian plate is moving northward and forcing under the Eurasian plate. This process (plate tectonics) causes earthquakes in this region. Geologists say that the collision of continents is squeezing up sedimentary rocks that were once below the sea. The mountains of Himalaya are the result of the collision of continents.