The Kingdom of Bhutan lies in the eastern Himalayas, between Tibet to the north and the Indian territories of Assam and West Bengal to the south. The Kingdom has a total area of about 47,000 square kilometres. Located in the heart of the Himalayan mountain range, Bhutan is a land-locked country surrounded by mountains. The cultivated central uplands and Himalayan foothills support the majority of the population. In the south, the Daurs Plain drops sharply away from the Himalayas into the large tracts of semi-tropical forest, savannah grassland and bamboo jungle. Early records suggest scattered clusters of inhabitants had already settled in Bhutan when the first recorded settlers arrived 1,400 years ago. Bhutan's indigenous population is the Drukpa.