Geomryeongso is identified as the source of the Han River according to the 'Taek-ri-ji', an 18th-century Korean geography book.
The water basin is shaped like a dragon's head, which inspired the name 'Geomryeongso' or 'Black Dragon Spring'.
The spring water never freezes, even during the coldest winter months in the Gangwon-do region.
The basin maintains a constant temperature of 9 degrees Celsius year-round due to its deep groundwater origins.
Geomryeongso was designated a Natural Monument of South Korea in 2010 to preserve its historical and ecological value.
Geomryeongso is recognized as the official source of the Han River, the primary waterway flowing through Seoul. It features a natural limestone spring where 20 to 30 tons of groundwater emerge daily from the base of Mt. Geumdaebong at an elevation of 920 meters. The water temperature remains constant at approximately 9 degrees Celsius throughout the year. The spring feeds into a narrow, winding stream that eventually joins the Namhangang River. The surrounding area is part of a designated natural monument zone due to its geological and cultural significance. The site is characterized by lush forest paths and rocky terrain leading directly to the basin.
The wooden observation platform directly overlooking the deep turquoise-colored water basin.
Wear sturdy, closed-toe hiking footwear, as the path involves gravel and uneven forest terrain.
Carry a light jacket even in summer, as the mountain forest air is significantly cooler than in the valley.
Follow the marked wooden deck paths to avoid disturbing the sensitive limestone ecosystem surrounding the spring.
Do not attempt to hike off the designated wooden paths or stairs, as the surrounding limestone soil is prone to erosion.
Do not touch, drink from, or throw coins into the spring water to maintain the purity of the natural monument.
