Kulen Mountain (also known as Phnom Kulen) is a significant and sacred mountain located in the northern part of Siem Reap province, Cambodia. It holds great historical, cultural, and religious importance, not only for its natural beauty but also for its role in the early history of the Khmer Empire. It is considered one of the most important pilgrimage sites in Cambodia and is part of the Kulen Mountain National Park. Phnom Kulen is often referred to as the “birthplace of the Khmer Empire.” It is believed that in the 9th century, King Jayavarman II declared himself the first king of Cambodia here, marking the beginning of the Angkorian period. The mountain is home to several ancient structures and carvings that highlight its religious importance, particularly in Hinduism and later in Buddhism. One of the most famous natural features of Kulen Mountain is the Kulen Waterfall. This stunning, multi-tiered waterfall is surrounded by lush greenery, creating a serene and picturesque atmosphere. The waterfall has become a popular spot for tourists and locals alike to relax, swim, and enjoy the natural beauty of the area. The clear, cool water provides a refreshing break from the heat of the surrounding region. Kulen Mountain is a haven for nature lovers. The surrounding area features dense forests, diverse wildlife, and a rich ecosystem. It is a popular destination for hiking and trekking, with several trails leading to hidden temples, caves, and stunning viewpoints..