The Tarai occupies the southern musts part of the country and consists of deep alluvial material. The Tarai is known as the granary of Nepal. Because of dense forests like charkoshe jhadi malaria used to be a nuisance however now the region hosts many different ethnic caste / groups who have come from the hills and mountains. The mountains, hill and forest have proved a natural bulwark for Nepal against foreign invasion. Traditionally these had a distinct inhabitant in various ecological zones of Nepal. After 1990, they become distributed throughout Nepal.
Mostly in the Terain and in Kathmandu including Muslims, Christian and Sikhs is the distinct religious group. The people of the northern valley follow Tibetan cultural traditions regarding language, religion and economic. Their lifestyle is similar to those of Tibetan people in many respects because of the geographical proximity and origin. At the other extreme the people of the Terai except the Tharus are oriented towards the culture and economic of the Genetic plain. The temperature highland are the natural home land of the Tebeto-Burman people who speak their own dialects. The caste –stratified Paharis who speak Nepali are widely distributed in the lower sub- tropical zones. Prior to the arrival of the Hindus from the eastern and western parts of the Himalayas, the Hills include the Gurung and Magar in the central hills the Tamangs are the most prevalent, followed by the Rai and Limbu ethnic groups in eastern Nepal.
