On the basis of topography and climatic variations, Nepal is distinguished into three echological regions Vitz. Himalayan region, Hilly region & Terai region. Himalayan region ( Mountain region) include 51817 sq.km. land area covered with high snow-claded mountain ranges from east to west in northern part of the country. This region includes the tallest mountains of the world like Sagarmatha ( Mt. Everest ) , Makalu ( Mt. Makalu ) , Kanchanjunga and so on. Hilly region lies in between the Mountain region and Terai region with total land area of 61345 sq. km. covered with rocky moutains and steepy hills. The southern part of the country consist of low plain fertile land of 34019 sq. km. commonly known as Terai. Terai region is separated from hilly region by east - west range of mountains known as Churiya & Mahabharata Ranges. Terai region consist of fertile plain land ( silty aluvial soil ) & moderate climate which is best for cultivation. Thus it is the grainery of country.
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