tors (isolated weathered rocks) in southwestern Northern Territory, Australia, comprising a circular grouping of some 36 red conglomerate domes rising from the desert plains north of the Musgrave Ranges. They occupy an area of 11 square miles (28 square km) within Uluru-Kata Tjuta National Park (established in 1958 as the former Ayers Rock-Mount Olga National Park) and culminate at Mt. Olga, 1,500 feet (460 metres) above the plain and 3,507 feet above sea level. Mt. Olga is the most westerly of Australia's three giant tors; the others are Ayers Rock (called Uluru by the region's Aboriginals) and Mt. Conner (Conner, Mount). They were visited and named in 1872 after Queen Olga of Württemberg by the explorer Ernest Giles. Their Aboriginal name, Kata Tjuta means “many heads.” The rocks offer visitors a constantly changing array of colour as the sun moves overhead and illuminates the luxurious vegetation in deep clefts between the domes.