Three Sisters, Rock formation in Blue Mountains, Australia.

The Three Sisters are three sandstone pillars on the north escarpment of the Jamison Valley near Katoomba, New South Wales. Named Meehni (922 m), Wimlah (918 m) and Gunnedoo (906 m), they stand close together, with horizontal bands of orange, tan and grey rock and patches of green vegetation on their ledges. A metal walkway links the left pillar to the cliff, and four further rock stumps nearby suggest the group once counted seven.

The formation began around 200 million years ago when the area lay underwater and sediments settled, later turning into sandstone. Erosion from wind, rain, and frost carved the three individual peaks from the original cliff face over millions of years.

The names Meehni, Wimlah and Gunnedoo were given to the formation by Patricia Stone, a 16-year-old schoolgirl, not by the Gundungurra. The Gundungurra and Darug are the traditional owners, and the site was declared an Aboriginal Place in 2014. Climbing and paragliding have been banned out of respect for Aboriginal traditions.

Visitors reach the main viewpoint at Echo Point, from where the three peaks are clearly visible, and can then walk down the Giant Stairway into the valley if they are prepared for the climb back up. The descent and return require good physical fitness, as several hundred steps must be taken.

The formation received official recognition as an Aboriginal Place in 2014, a legal classification in New South Wales that protects sites of special meaning to indigenous people. It was the 98th site to receive this status and is now one of the most visited among them.