The Siliguri subdivision is surrounded by Himalayan ranges towards north and towards south by the country Bangladesh , Uttar Dinajpur district of West Bengal and the Indian state of Bihar. Department of Municipal Affairs". The forest here is moist Tropical and characterised by dense growth of tall Sal i. Recently this stadium is all set to get a facelift. Siliguri also has a large population of Tibetans and a notable number of Bhutanese permanently settled in the city. The Dooars in Historical Transition.