Start from the signposted car park at Öndverdarnes. A marked path leads past the lava to Vatnsborg. Caves, rocky pools and lush pockets of bracken and flowering plants abound in the lava. Vatnsborg is a bracken-filled crater encircled by crags. The trail leads on to Grashóll then along Nesgata, an old cairned track, returning to the start along the road. The craters and plant life are sensitive to disturbance – please keep to the signposted footpaths.