While the climbs are not particularly steep, Sobaek-san can be demanding, wending through dense forests, picturesque valleys and even a waterfall. The main trail (7km, 2½ hours) heads from the park entrance at Darian to the highest peak of Biro-bong (1439m), famous for royal azaleas which bloom in late May. Views are incredible from the grassy mountaintop. It can also be approached from the campground at Samga (5.7km, 2½ hours).
From Biro-bong, you can push on to the three peaks of Yeonhwa-bong (2.5km to 6.8km); the National Astronomical Observatory is here but not open to visitors.
