Oseo mountain was named Oseo because there were many crows and magpies. Also ships that pass the Cheonsu village found the direction by this mountain, so this mountain also called the "Lighthouse of the West Sea."

Kumbuk branch mountain which is connected to Baekdu mountain continues to the west until the front sea of Daecheon and it stops right before it falls into the West Sea. When you climb up to main ridge, you will see the great landscape of the West Sea, and also you will enjoy the path which is covered with many grasses. Many people are so impressed by this landscape that they forget to climb.

This is located at Janghyeon-ri, Cheongla-myeong, Boryeongsa, takes about 15 minutes from the village