Kata Tjuta, Pitjantjatjara: also known as the Olgas, is a group of large, domed rock formations or bornhardts located about 365km southwest of Alice Springs, in the southern part of the Northern Territory, central Australia. Uluru, also known as Ayers Rock, located 25km to the east, and Kata Tjuta/Mount Olga form the two major landmarks within the Uluru-Kata Tjuta National Park. The park is considered sacred to the Aboriginal people of Australia.
The 36 domes that make up Kata Tjuta/Mount Olga cover an area of 21.68km2, are composed of conglomerate, a sedimentary rock consisting of cobbles and boulders of varying rock types including granite and basalt, cemented by a matrix of sandstone. The highest dome, Mount Olga, is 1066m above sea level, or approximately 546m above the surrounding plain (198m higher than Uluru). Kata Tjuta is located at the eastern end of the Docker River Road.