Kbal Spean — the "River of a Thousand Lingas" — is one of the most unusual sacred sites in the Angkor region, located about 50 kilometres north of Siem Reap in the Kulen Hills. A 40-minute forest walk from the car park leads to a stretch of the Stung Kbal Spean river where the 11th and 12th-century Khmer carved the riverbed itself with an extraordinary density of sacred imagery: rows of lingas, reclining Vishnus, nagas, and various mythological scenes, all cut directly into the sandstone rock under the flowing water.
The carvings are best seen in the dry season (December to May) when water levels are low — the images are clearly visible in the shallower sections, while water flows over them and around them in a way that makes the whole site feel actively, continuously alive. The walk through the forest is pleasant in itself, passing a small waterfall and several less-elaborate carvings. Combine with Banteay Srei, 15 kilometres to the south; most tuk-tuk drivers know the route and the two sites make a full day out.