Nestled in the upper reaches of the valley on the southwestern slope of Mt Ongnyon in Pujon County, South Hamgyong Province, lies the Ongnyonsan Stone River, a Natural Monument in Korea.
Mt Ongnyon, soaring 2,164m above sea level in the southern tip of the Puksubaek Mountains along the meridian line on the Kaema Plateau, serves as the majestic backdrop to this geological wonder.
Characterized as the country’s largest and rarest stone river, the Ongnyonsan Stone River showcases a unique landform resulting from the descent of rock masses from the outskirts of glaciers to the valley floor.
Spanning an impressive 120m in width and extending for 700m in length, the stone river captivates observers with the sheer marvel of nature. With a gentle gradient of approximately 10 degrees, the water flows invisibly beneath the stones, creating a soothing symphony of running water.
The stones, piled up to an average thickness of 4-5m and reaching an impressive 15-20m at the valley bed, exhibit weathered edges in irregular shapes, featuring various cubic or plate sizes.
Designated as a Natural Monument, the Ongnyonsan Stone River not only enhances the scenic beauty of the mountainous landscape but also holds academic significance, offering valuable insights into the study of mountain glaciers. Its distinct features and geological composition make it a testament to the intricate forces of nature, drawing both admirers of natural wonders and scholars keen on exploring the mysteries of Korea’s diverse and captivating landscapes.
