The largest known area of slot canyons in Australia (containing over 900) is in the Blue Mountains, west of Sydney. They occur in a narrow band of sandstone that runs roughly from east to west, and about from south to north. The majority of these canyons are in the Wollemi Wilderness, and are difficult to access. Many canyons within the Wollemi Wilderness have yet to be explored by humans. A small number are regularly visited by canyoners on weekends in summer with those closest to Katoomba being the most frequently visited. The Grand Canyon, near Blackheath, has a tourist track along its rim, but requires abseiling (rappelling) or swimming to visit fully.
