The Namal Uyana of Dambulla is one of the most significant sanctuaries in the country. Its importance lies in the fact that it is the largest ironwood or Na tree forest in Asia. Even though the planting of Na trees commenced in the time of King Devanampiyatissa, the expansion and plantation continued for much later on when the area was used as a prison camp in which the punishment was to plant Na trees. In addition to the unique flora, Namal Uyana also features the largest pink quartz mountain range in Asia which has the history of more than 550 million years. Namal Uyana is home to 102 species of tropical plants of which 82 are herbal plants within 260 acres garden and the forest bordering it. As for fauna, 18 bird species and a number of mammals including elephant, leopard, monkey and deer call this park their home.