Natural Resources

        Bihar lies in the tropical to sub tropical region. Rainfall here is the most significant factor in determining the nature of vegetation. Bihar has a monsoon climate with an average annual rainfallof 1200 mm.

 Forests

          The sub Himalayan foothillof someshwar and Dun rangesin Champaran constitute another belt of moist deciduous forests. These also consists of scrub, grass and reeds. Here the rainfall is above 1600 mm and thus promotes luxuriant Sal forests in the favoured areas. The hot and dry summer gives the deduous forests. The most important trees are Shorea Robusta (Sal), Shisham, Cedrela Toona, Khair, and Semal. This type of forests also occurs in Saharasa and Purnia districts.