Bhutan.

Bhutan officially the Kingdom of Bhutan, is a landlocked state in South Asia, located at the eastern end of the Himalayas and bordered to the south, east and west by the Republic of India and to the north by the People's Republic of China. Bhutan is separated from the nearby country of Nepal to the west by the Indian state of Sikkim, and from Bangladesh to the south by Assam and West Bengal.Stone tools, weapons, elephants, and remnants of large stone structures provide evidence that Bhutan was inhabited as early as 2000 BC, although there are no existing records from that time. Historians have theorized that the state of Lhomon (literally, "southern darkness", a reference to the indigenous Mon religion), or Monyul ("Dark Land", a reference to the Monpa, the aboriginal peoples of Bhutan) may have existed between 500 BC and AD 600. The names Lhomon Tsendenjong (Sandalwood Country), and Lhomon Khashi, or Southern Mon (country of four approaches), have been found in ancient Bhutanese and Tibetan chronicles.More than 770 species of bird and 5,400 species of plants are known to occur throughout the kingdom. Bhutan has a rich primate life with rare species such as the golden langur. Recently, a variant Assamese macaque, which is also regarded by some authorities as a new species, Macaca munzala has also been recorded.Paro Airport is the only international airport in Bhutan. Yongphulla Airport in Trashigang is a small domestic airport that underwent upgrades through 2010. Yongphulla Airport was scheduled for completion in January 2010, but as of August 2011 work is still ongoing. There are plans for further domestic airports to be built at Bathpalathang in Bumthang District and at Gelephu in Sarpang District, which were due to start operations in June 2011.