[1] There is a sanctuary in the area, Phnom Kulen National Park, straddling the districts of Svay Leu and Va Rin.

Its purpose is recreational and scientific in order to preserve the natural scenic features of Phnom Kulen mountain, like some famous waterfalls.

[2] The effort continued in 2016 when over 300 families were removed from already crowded areas and existing facilities for tourists were upgraded.

[3] The Phnom Kulen mountain range is located 30 kilometres (19 mi) northwards from Angkor Wat.

Near these mountains is Preah Ang Thom, a 16th-century Buddhist monastery notable for the giant reclining Buddha, the country's largest.

[5] The Samré tribe was formerly living at the edge of Phnom Kulen, quarrying sandstone and transporting it to the royal sites.

[9] Phnom Kulen was further developed under the rule of Udayadityavarman II, who made it the capital of his empire and constructed many temples and residences as well as the 1000 Lingas at Kbal Spean.

At its peak, the Kulen development was larger than modern-day Phnom Penh and one of the largest cities in the 11th-century world.

Carvings include a stone representation of the Hindu god Vishnu lying on his serpent Ananta, with his wife Lakshmi at his feet.

Peung Tbal is a large rock site which has carvings of the Hindu gods Vishnu, Shiva, Brahma, and Ganesh.

Peung Aysey is another site located inside of the jungle of Kulen and contains more rock carvings of Hindu gods and is said to have been a meditation place for rishis.