Situated in the east of Hwabuk 1-dong and along the coast, Byeoldobong is a parasitic mountain made of siliciclastic sedimentary rocks and lava. Its northern slope is dominated by steep cliffs where a large rock called Jasalbawi Rock (Suicide Rock) is located. At the bottom of the cliffs are Goraegul Cave (Whale Cave) and an oddly-shaped rock that looks like a mother carrying her child on her back.

Despite being only 136m high, Byeoldobong is home to Jangsu Trail, a walking path that stretches over 1.8km around coastal cliffs, overlooking the ocean. Considered the most pleasant trail on Jeju Island, it offers a spectacular view of numerous peaks, Jeju Port and its nearby villages, and the emerald-blue sea. Naturally, it is a popular tourist destination for family visitors and couples.