Kbal Spean is an Angkorian era archaeological site on the southwest slopes of the Kulen Hills to the northeast of Angkor in Siem Reap District, Siem Reap Province, Cambodia. It is situated along a 50 metres (160 ft) stretch of the Stung Kbal Spean River, 25 kilometres (16 mi) from the main Angkor group of monuments.
The site consists of a series of stone carvings in sandstone formations carved in the river bed and banks. It is commonly known as the "Valley of a 1000 Lingas" or "The River of a Thousand Lingas". The motifs for stone carvings are mainly myriads of lingams, depicted as neatly arranged bumps that cover the surface of a sandstone bed rock, and lingam-yoni designs. There are also various Hindu mythological motifs, including depictions of the gods Shiva, Vishnu, Brahma, Lakshmi, Rama, and Hanuman, as well as animals.
Kbal Spean is described as "a spectacularly carved riverbed, set deep in the jungle to the northeast of Angkor". The river over which the bridge head exists is also known as Phnom Kbal Spean, a tributary of the Siem Reap River that rises in the Kulein mountains north of Banteay Srei. The river bed cuts through sandstone formations, and the many architectural sculptures of Hindu mythology have been carved within the sandstone.
The archaeological site occurs in a stretch of the river starting from 150 metres (490 ft) upstream north of the bridge head to the falls downstream. The river, being sanctified by flowing over the religious sculptures, flows downstream, bifurcating into the Siem Reap River and Puok River, which eventually flows into the Tonlé Sap Lake after passing through the plains and the Angkor temple complex.