The Ninety-Nine Curves of Chonsang Stream are located in the valley through which flows Chonsang Stream, a branch of the Yonmyon River rising from Kwanmo Peak of the Hamgyong Mountain Range.
Chonsang Stream means the water in a high place, and Ninety-Nine Curves, a large number of rocky curves. The stream is also called a rocky river with ninety-nine curves.
The bottom and both sides of curves formed by unique texture of granite are all bedrocks.
In the rainy season its swift current runs down with roaring sound, and in the dry season round stones, large and small, come into view everywhere.
Chonsang Stream is 4 to 18 metres wide, 3 to 10 metres deep (over 10 metres in the deepest), and 18 km long (16 km in a beeline).
As the river in the highest place in Korea, it is a natural monument of significance for scientific research.