Kbal Spean  ("Head Bridge") is an Angkorian era site on the southwest slopes of the Kulen Hills in Cambodia, 25 km from the main Angkor group. It is commonly known as the valley of a 1000 Lingas.[1] It consists of a series of stone carvings in and around the Stung Kbal Spean river. The motifs for the stone carvings are roughly three: myriads of lingams, depicted as neatly arranged bumps that cover the surface of a rock; lingam - yoni designs; and various Hindu mythological motifs, including depictions of gods and animals.

Kbal Spean, the original 'River of a Thousand Lingas', is relatively new to many tourists due to its rugged terrain. Located on the holy mountain of Phnom Kulen, these 11th century intricate riverbed rock carvings are set in a secluded forest. As you approach a gallery of fine rock carvings gradually unfolds, including carvings of Vishnu reclining by a Naga (a giant serpent with multiple heads), Lakshmi, Rama and Hanuman. In the middle of the stream lie thousands of sculpted lingas or phallic images and a large underwater representation of a yoni(womb). These sculptures were lavishly made with a specific purpose - the lingas in the riverbed were to bless the stream of Kbal Spean that flows down through the city of Angkor, blessing its waters with fertility for the vitally important lowland rice fields. To reach the Kbal Spean riverbed carvings a 40 minute uphill trek is required, the path winds its way through knotted vines and big boulder formations and occasionally offers big views over the surrounding jungle.