The trail passes through dense pine woods as it ascends the summit of Barnaslingan Hill (). The summit looks over The Scalp, a narrow glacial valley created during the last Ice Age. This slender channel was gouged out by escaping meltwater draining from a glacial lake. These glacial origins are evident from the granite outcrops and boulders that litter the hillside. The Scalp is an important example of a glacial lake outflow and is listed as an Area of Scientific Interest. The trail descends through the woods and emerges onto the R117 (Enniskerry) Road.