|Stratigraphic range: Triassic|
|Unit of||Great Dividing Range|
|Coordinates||33°44′8″S150°18′52″E / 33.73556°S 150.31444°E|
|Named for||Indigenous mythology|
The Three Sisters are an unusual rock formation in the Blue Mountains of New South Wales, Australia, on the north escarpment of the Jamison Valley. They are located close to the town of Katoomba and are one of the Blue Mountains' best known sites, towering above the Jamison Valley.  Their names are Meehni (922 m), Wimlah (918 m), and Gunnedoo (906 m). 
The formation receives more than 600,000 visitors per year. 
The Three Sisters were formed by land erosion around 200 million years ago during the Triassic period when the sandstone of the Blue Mountains was eroded over time by wind, rain and rivers, causing the cliffs surrounding the Jamison Valley to be slowly broken up.
When the Blue Mountains were covered in seawater, the ocean carried large amounts of sediment that gradually sunk to the floor in crosswise layers. These layers later created rock beds and shales. Around 200 million years ago, volcanoes erupted through the coal, sandstone and shale layers, forming the ridges and the shape of the Three Sisters. 
The commonly told legend of the Three Sisters is that three sisters, Wimalah, Meeni, and Gunedoo,  lived in the Jamison Valley as members of the Katoomba tribe. They fell in love with three men from the neighbouring Nepean tribe, but marriage was forbidden by tribal law. The brothers were not happy to accept this law and so decided to capture the three sisters. A major tribal battle ensued, and the sisters were turned to stone by an elder to protect them, but he was killed in the fighting and no one else could turn them back.
This legend is commonly claimed to be an Indigenous Australian Dreamtime legend.  However, the legend as is commonly told may be traced back to non-indigenous 16-year-old schoolgirl Patricia Stone, who gave the formations their "indigenous" names.  
The Aboriginal traditional owners, the Gundungurra, have a different legend that includes the Sisters rock formation. 
The Three Sisters were declared an Aboriginal Place in January 2014, making it the 98th place in New South Wales to be declared as such. 
From nearby Echo Point, a bushwalking trail leads to the Three Sisters and down to the valley floor via more than 800 well-maintained steel and stone steps called "the Giant Stairway". Then a 1.5-hour walk on The Federal Pass trail leads to the base of Katoomba Falls and the Katoomba Scenic Railway. Walkers who don't wish to climb back to the top can take the Scenic Railway back to the plateau for a fee.[ citation needed ]
The Blue Mountains are a mountainous region and a mountain range located in New South Wales, Australia. The region is considered to be part of the western outskirts of the Greater Sydney Region, The region borders on Sydney's main metropolitan area, its foothills starting about 50 kilometres (31 mi) west of centre of the state capital, close to Penrith on the outskirts of Greater Sydney region. The public's understanding of the extent of the Blue Mountains is varied, as it forms only part of an extensive mountainous area associated with the Great Dividing Range. As defined in 1970, the Blue Mountains region is bounded by the Nepean and Hawkesbury rivers in the east, the Coxs River and Lake Burragorang to the west and south, and the Wolgan and Colo rivers to the north. Geologically, it is situated in the central parts of the Sydney Basin.
Katoomba is the chief town of the City of Blue Mountains in New South Wales, Australia, and the administrative headquarters of Blue Mountains City Council. The council's understanding is that Katoomba is located on the lands of the Dharug and Gundungurra Aboriginal peoples. Katoomba is situated on the Great Western Highway, Katoomba is also known as a suburb of Greater Sydney but is known as a town which is home to the three sisters, 102 km (63 mi) west of Sydney Central Business District and 39 km (24 mi) south-east of Lithgow. Katoomba railway station is on the Main Western line.
The Blue Mountains National Park is a protected national park that is located in the Blue Mountains region of New South Wales, in eastern Australia. The 267,954-hectare (662,130-acre) national park is situated approximately 80 kilometres (50 mi) west of Sydney, and the park boundary is quite irregular as it is broken up by roads, urban areas and inholdings. Despite the name mountains, the area is an uplifted plateau, dissected by a number of larger rivers. The highest point in the park is Mount Werong at 1,215 metres (3,986 ft) above sea level; while the low point is on the Nepean River at 20 metres (66 ft) above sea level as it leaves the park.
The Wollemi National Park is a protected national park and wilderness area that is located in the northern Blue Mountains and Lower Hunter regions of New South Wales, in eastern Australia. The 501,703-hectare (1,239,740-acre) park, the second largest national park in New South Wales, contains the 361,113-hectare (892,330-acre) Wollemi Wilderness – the largest such wilderness area in Australia – and is situated approximately 130 kilometres (81 mi) northwest of Sydney.
Scenic World is a private, family-owned tourist attraction located in Katoomba in the Blue Mountains, New South Wales, Australia, about 100 kilometres west of Sydney. Scenic World is home to four attractions, the Scenic Railway, the Scenic Skyway, the Scenic Cableway and Scenic Walkway a 2.4 km elevated boardwalk through ancient rainforest.
The Jamison Valley forms part of the Coxs River canyon system in the Blue Mountains of New South Wales, Australia. It is situated approximately 100 kilometres west of Sydney, capital of New South Wales, and a few kilometres south of Katoomba, the main town in the Blue Mountains.
Megalong Valley is part of the Blue Mountains of New South Wales, Australia. It is located west of Katoomba. On its eastern side, the valley is separated from the Jamison Valley by Narrow Neck Plateau. The Shipley Plateau overlooks part of the valley.
The Narrow Neck Plateau, an eroded remnant of a sandstone layer situated at an elevation of 1,000 metres (3,300 ft) above sea level that is part of the Blue Mountains Range which is a spur line off the Great Dividing Range, is situated immediately south-west of Katoomba in New South Wales, Australia, located within the Blue Mountains National Park. The neck separates the Jamison Valley from the Megalong Valley.
Wentworth Falls is a town in the Blue Mountains region of New South Wales, situated approximately 100 kilometres (62 mi) west of the Sydney central business district, and about 8 kilometres (5.0 mi) east of Katoomba, Australia on the Great Western Highway, with a Wentworth Falls railway station on the Main Western line. The town is at an elevation of 867 metres (2,844 ft) AHD . At the 2016 census, Wentworth Falls had a population of 6,076.
Catalina Park is a disused motor racing venue, located at Katoomba, in the Blue Mountains, New South Wales, Australia, and is recognised as an Aboriginal Place due to the long association of the local Gundungarra and Darug clans to the area.
Mount Solitary, a mountain that is part of the Blue Mountains Range, a spur off the Great Dividing Range, is situated within the Blue Mountains National Park, New South Wales, Australia. Mount Solitary is located approximately 100 kilometres (62 mi) west of Sydney, and a few kilometres south of Katoomba, the main town in the Blue Mountains.
Wentworth Falls is a three-tiered waterfall fed by the Jamison Creek, near the town of Wentworth Falls in the Blue Mountains region of New South Wales, Australia. The falls are accessible via the National Pass Walking Trail and the Overcliff/Undercliff Walk. The total height of the waterfall is 187 metres (614 ft).
The Ruined Castle is a rock formation in the Jamison Valley area of the Blue Mountains, in New South Wales, Australia.
The Kings Tableland is a plateau, located in the Blue Mountains in Wollondilly Shire, New South Wales, Australia. The ridge is an eroded remnant of a sandstone layer that is approximately 1,000 metres (3,300 ft) AMSL, situated immediately south of Wentworth Falls. The Tableland is the major southerly spur of the main spine of the Blue Mountains Range and forms the beginning of the Southern Escarpment, an unbroken series of tall sandstone cliffs which fringes the Jamison, Megalong, Kanimbla and Hartley Valleys.
The Kedumba River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Blue Mountains and Macarthur regions of New South Wales, Australia.
The Narrabeen group of sedimentary rocks occurs in the Sydney Basin in eastern Australia. This series of rocks was formed in the Triassic Period.
The Katoomba Falls is a segmented waterfall that is located close to Echo Point near Katoomba on the Kedumba River descending into the Jamison Valley located within the Blue Mountains National Park in the Blue Mountains region of New South Wales, Australia.
Echo Point is a lookout about 2 kilometres (1.2 mi) south of Katoomba, New South Wales, Australia. It attracts an estimated 1.5–2 million visitors each year. The lookout offers a view to Three Sisters, Mount Solitary and the rock formation known as the Ruined Castle. A short walk from Echo Point leads to The Giant Stairway which provides access to a number of nature walks through Jamison Valley.
The Coxs River track is a heritage-listed former walking track and road and now walking track at Cox's River Arms, Lake Burragorang/Warragamba Dam, City of Blue Mountains, New South Wales, Australia. The track is also known as the Warragamba Dam - Burragorang Valley - Wentworth Falls Track. The property is owned by the Sydney Catchment Authority, an agency of the Government of New South Wales. It was added to the New South Wales State Heritage Register on 18 November 1999.