One interesting place to visit in Phnom Kulen National Park, -around 50 km North of Siem Reap, Cambodia-, is the ancient carved Lingas on the riverbed of Siem Reap which are spreading out around 5 – 10 cm under the surface water of the river.
The small carved lingas and yonis are believed by the locals as sacred and holy, since those are representing Shiva in Hinduism. The flowing water over the religious sculptures is believed to sanctify the river, before it reaches the rice fields and Angkor temples. Many local people bottle the water from the waterfalls not far from the site.
Phnom Kulen itself is believed as the first site of ancient Khmer Empire, the place where Jayavarman II declared the independence of Khmer Empire and claimed himself as the Devaraja on 8th-century.