Phnom Kulen, located in the Phnom Kulen National Park, is a sacred mountain in Cambodia with historical and cultural significance. The mountain holds religious importance, and the area features unique points of interest, including hidden temple ruins, the River of a Thousand Lingas, and a giant reclining Buddha statue. The hike to the summit of Phnom Kulen takes you through lush jungles and offers stunning views of the surrounding landscape.