This walk starts at the National Parks information office and ascends steeply up steps on a path up by Poulanass Waterfall. The route continues up a winding trail to a spectacular viewing point overlooking the Upper Lake. It takes you in a circle initially on boardwalk and then on open mountain trails under Lugduff Mountain which is a good place to spot deer and birds such as Raven, Merlin and Kestrel. The trail then winds down through the valley on a forest road returning to Glendalough valley.

Grade: Strenuous
Distance: 14.5km
Estimated time: 4hrs
Type: Loop