Hallasan Mountain has five trails excluding Donnaeko Course that is closed for nature preservation. Yeongsil Trail is known as the best autumn foliage course on Hallasan Mountain. Yeongsil Course is 3.7 kilometers and takes approximately 1 hour and 40 minutes. It starts from Yeongsil Rest Area and follows a relatively gentle slope lined with beautiful trees and autumn foliage for about one kilometer.
After that, an uphill path emerges along steep mountain ridges. The deep Yeongsilgyegok Valley and vast rock walls could be the result of a large volcano entrance in the past. After passing Byeongpungbawi Rock, the path becomes relatively flat until Witsaeoruem Rest Area. The first attraction of Yeongsil is a group of volcanic rocks collectively called Yeongsilgiam. These oddly shaped rocks are situated to the right of a big valley at 1,400 meters to 1,600 meters above sea level, soaring upwards towards the sky. Pass by Sajebi Hill to get a glass of mineral spring water, and reach Eorimok to take the path downwards.