Tunnel Terrace Gorge
is a cliff-lined gorge and north-south tributary of Tunnel Creek, located above and on the northern side of the Glowworm Tunnel, Newnes. Named by Peter Medbury on a bushwalk he led in the area on 10 January 2009. Peter records, "Tunnel Terrace Gorge is a large blind canyon behind the Glowworm Tunnel. The gorge was eroded by a tributary of Tunnel Creek. The western walls of the gorge are sheer cliffs topped by fabulous platy pagodas. The eastern wall is a low cliff line decorated with another set of pagodas. Erosion under the western cliffs has created an amazing series of overhangs and terraces along almost the entire length of the gorge. The floor of the gorge is covered with beautiful forest. The northern end of the gorge is dominated by a single tree that towers above the forest and cliff walls. The gorge looks like there is no easy way in or out. On the eastern side, not far from the northern end of the gorge, there is a narrow hidden slot that leads up out of the gorge. "
Wollemi National Park