province no. 1 covers an area of 25,905 km. the province has three-fold geographical division: himalayan in the north, hilly in the middle and terai in the southern part of nepal, varying between an altitude of 70 m and 8,848 m. terai, extended from east to west, is made up of alluvial soil. to the west of koshi river, in between mahabharat range and churia range, there elongates a valley called inner terai. churai range, mahabharat range and other hills of various height, basins, tars and valleys form the hilly region. some parts of this region are favorable for agriculture but some other parts are not. himalayan region, in the north, consists of many mountains ranges. mahalangur, kumbhakarna, umvek, lumba sumba and janak being some of them. the highest mountain in the world, mount everest (8848 m); and the third highest mountain, kangchenjunga (8598 m) also lie in this province.