The oldest garden in the country, the Namal Uyana located near Dambulla has the largest Rose Quartz mountain in South Asia consists of 972 hectares. It is said to have been declared a Human Sanctuary by King Dappula in the 10th century AD, as inscribed at the entrance to the forest. The forest also offers a fascinating nature trails through the deep Naa Tree jungle. In addition to the unique biodiversity of the forest, it is also geologically significant due to the Rose Quartz mountain range, believed to be over 500 million years old. Quartz deposits in the shades of rose, violet and white can be found here.